48 results on '"K Pina"'
Search Results
2. The Berkeley Sample of Type II Supernovae: BVRI Light Curves and Spectroscopy of 55 SNe II
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T de Jaeger, W Zheng, B E Stahl, A V Filippenko, T G Brink, A Bigley, K Blanchard, P K Blanchard, J Bradley, S K Cargill, C Casper, S B Cenko, S Channa, B Y Choi, K I Clubb, B E Cobb, D Cohen, M de Kouchkovsky, M Ellison, E Falcon, O D Fox, K Fuller, M Ganeshalingam, C Gould, M L Graham, G Halevi, K T Hayakawa, J Hestenes, M P Hyland, B Jeffers, N Joubert, M T Kandrashoff, P L Kelly, H Kim, M Kim, S Kumar, E J Leonard, G Z Li, T B Lowe, P Lu, M Mason, K J McAllister, J C Mauerhan, M Modjaz, J Molloy, D A Perley, K Pina, D Poznanski, T W Ross, I Shivvers, J M Silverman, C Soler, S Stegman, S Taylor, K Tang, A Wilkins, Xiaofeng Wang, Xianggao Wang, H Yuk, S Yunus, and K D Zhang more...
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Astronomy - Abstract
In this work, BVRI light curves of 55 Type II supernovae (SNe II) from the Lick Observatory Supernova Search programme obtained with the Katzman Automatic Imaging Telescope and the 1 m Nickel telescope from 2006 to 2018 are presented. Additionally, more than 150 spectra gathered with the 3 m Shane telescope are published. We conduct an analyse of the peak absolute magnitudes, decline rates, and time durations of different phases of the light and colour curves. Typically, our light curves are sampled with a median cadence of 5.5 d for a total of 5093 photometric points. In average, V-band plateau declines with a rate of 1.29 mag (100 d)(exp −1), which is consistent with previously published samples. For each band, the plateau slope correlates with the plateau length and the absolute peak magnitude: SNe II with steeper decline have shorter plateau duration and are brighter. A time-evolution analysis of spectral lines in term of velocities and pseudo-equivalent widths is also presented in this paper. Our spectroscopic sample ranges between 1 and 200 d post-explosion and has a median ejecta expansion velocity at 50 d post-explosion of 6500 km s(exp −1) (H α line) and a standard dispersion of 2000 km s(exp −1). Nebular spectra are in good agreement with theoretical models using a progenitor star having a mass <16M⨀. All the data are available to the community and will help to understand SN II diversity better, and therefore to improve their utility as cosmological distance indicators. more...
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- 2019
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3. Impact of biomass burning and non-exhaust vehicle emissions on PM10 levels in a mid-size non-industrial western Iberian city
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Casimiro Pio, Ismael Casotti Rienda, Teresa Nunes, Cátia Gonçalves, Oxana Tchepel, Noela K. Pina, João Rodrigues, Franco Lucarelli, and Célia A. Alves
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Atmospheric Science ,General Environmental Science - Published
- 2022
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4. Masers and the massive star formation process: New insights through infrared observations
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James M. De Buizer, Charles M. Telesco, James T. Radomski, and Robert K. Pina
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Physics ,Infrared ,Star formation ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Observable ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Circumstellar disk ,law.invention ,Space and Planetary Science ,law ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Maser ,Astrophysics::Galaxy Astrophysics - Abstract
Our mid-infrared and near-infrared surveys over the last five years have helped to strengthen and clarify the relationships between water, methanol, and OH masers and the star formation process. Our surveys show that maser emission seems to be more closely associated with mid-infrared emission than cm radio continuum emission from UC HII regions. We find that masers of all molecular species surveyed trace a wide variety of phenomena and show a proclivity for linear distributions. The vast majority of these linear distributions can be explained by outflows or shocks, and in general do not appear to trace circumstellar disks as was previously thought. Some water and methanol masers that are not associated with radio continuum emission appear to trace infrared-bright hot cores, the earliest observable stage of massive stellar life before the onset of a UC HII region., Comment: 6 pages, 3 figures, to appear in the proceedings of IAU Symposium 227: "Massive Star Birth: A Crossroads of Astrophysics", version with full-resolution images available at http://www.ctio.noao.edu/~debuizer more...
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- 2005
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5. Dust Morphology and Composition in FU Orionis Systems
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Harold M. Butner, David K. Lynch, Elisha Polomski, Michael L. Sitko, E. K. Holmes, Robert K. Pina, Diane H. Wooden, Charles E. Woodward, Ray W. Russell, and Charles M. Telesco
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Physics ,Infrared ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Circumstellar disk ,law.invention ,Photometry (optics) ,T Tauri star ,Stars ,Space and Planetary Science ,law ,High spatial resolution ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Maser ,Spectroscopy ,Astrophysics::Galaxy Astrophysics - Abstract
FU Orionis stars are a small group of pre–main-sequence stars known for large-amplitude optical variability. These objects also exhibit multiwavelength phenomena suggestive of active accretion from a circumstellar disk. We present high spatial resolution mid-IR imaging and spectroscopy, submillimeter photometry, and 3–4 μm photometry of four FU Ori–class objects, RNO 1B and C, Z CMa, and Par 21, and one object classified as a pre–FU Ori star, V380 Ori. We resolve multiple IR sources and extended emission in the RNO 1B/C system, and we discuss in detail their association with disk activity and the source of the Infrared Astronomical Satellite far-IR and radio maser emission in this field. We derive dust temperatures and masses for all sources and discuss how dust composition and morphology is related to the evolutionary stage of these objects. more...
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- 2005
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6. Resolved Mid‐Infrared Emission in the Narrow‐Line Region of NGC 4151
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James M. De Buizer, Robert K. Pina, Charles M. Telesco, Andrew Robinson, R. Scott Fisher, James T. Radomski, and Chris Packham
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Physics ,Telescope ,Spectrometer ,Space and Planetary Science ,law ,Hubble space telescope ,Resolution (electron density) ,Mid infrared ,Astronomy and Astrophysics ,Torus ,Astrophysics ,Line (formation) ,law.invention - Abstract
We present subarcsecond resolution mid infrared images of NGC 4151 at 10.8 micron and 18.2 micron. These images were taken with the University of Florida mid-IR camera/spectrometer OSCIR at the Gemini North 8-m telescope. We resolve emission at both 10.8 micron and 18.2 micron extending ~ 3.5" across at a P.A. of ~ 60 degrees. This coincides with the the narrow line region of NGC 4151 as observed in [OIII] by the Hubble Space Telescope. The most likely explanation for this extended mid-IR emission is dust in the narrow line region heated by a central engine. We find no extended emission associated with the proposed torus and place an upper limit on its mid-IR size of less than or equal to ~ 35 pc. more...
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- 2003
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7. Local Heating in the Galactic Center Western Arc
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Naibí Mariñas, Charles M. Telesco, Mark C. Wyatt, Robert K. Pina, and R. S. Fisher
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Arc (geometry) ,Physics ,Stars ,Space and Planetary Science ,Infrared ,Extinction (astronomy) ,Galactic Center ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,Optical depth ,Galaxy ,Luminosity - Abstract
We present arcsecond resolution, 10.8, 11.7, and 18.2 μm images of the central few parsecs of the Galaxy. These images show for the first time the clumpiness of the dust in the western arc. The 11.7 and 18.2 μm images of part of the western arc were used to evaluate the dust temperature and optical depth distribution of this region. We see several mid-infrared emission peaks that coincide with dust temperature peaks and regions of low optical depth, and we infer the presence of embedded sources in the western arc. Minimum luminosity estimates for two of these sources (5 × 104 L⊙ and 2 × 104 L⊙) suggest that the circumnuclear ring is being locally heated by relatively young stars. more...
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- 2003
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8. The Dusty Circumstellar Environments of A[CLC]e[/CLC]/B[CLC]e[/CLC] Protoplanetary Disk Candidates
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Elisha Polomski, Charles M. Telesco, Benjamin L. Schulz, and Robert K. Pina
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Physics ,Debris disk ,Infrared ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Herbig Ae/Be star ,Protoplanetary disk ,Stars ,T Tauri star ,Space and Planetary Science ,Astrophysics::Solar and Stellar Astrophysics ,Circumstellar dust ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Galaxy Astrophysics ,Optical depth - Abstract
We have obtained high spatial resolution mid-IR observations of four intermediate-mass pre–main-sequence stars: HD 259431, AS 310, LkHα 234, and MWC 1080. Our observations reveal the morphology of the circumstellar (500–10,000 AU) environments of these young stars. We resolve companion stars and complex diffuse emission from dust that can account for on average 50% of the IR emission detected in previous low-resolution observations. We calculate new spectral indices for these objects and show that they differ from those expected from simple geometrically flat disk models. We also show mid-IR spectral energy distributions that reveal the presence of silicate emission and absorption features for several objects. Finally, temperature maps constructed from our observations suggest the presence of transiently heated grains, and optical depth maps point to the locations of the most embedded objects. more...
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- 2002
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9. High‐Resolution Mid‐Infrared Morphology of Cygnus A
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James T. Radomski, Charles M. Telesco, Chris Packham, Robert K. Pina, and Clive Tadhunter
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Physics ,Spectrometer ,Star formation ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics (astro-ph) ,Resolution (electron density) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,law.invention ,Telescope ,Wavelength ,Space and Planetary Science ,law ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Deconvolution ,Cygnus A ,Astrophysics::Galaxy Astrophysics ,Line (formation) - Abstract
We present subarcsecond resolution mid-infrared images at 10.8 and 18.2 microns of Cygnus A. These images were obtained with the University of Florida mid-IR camera/spectrometer OSCIR at the Keck II 10-m telescope. Our data show extended mid-IR emission primarily to the east of the nucleus with a possible western extension detected after image deconvolution. This extended emission is closely aligned with the bi-conical structure observed at optical and near-IR wavelengths by the HST. This emission is consistent with dust heated from the central engine of Cygnus A. We also marginally detect large-scale low level emission extending > 1.5 kpc from the nucleus which may be caused by in-situ star formation, line emission, and/or PAH contamination within the bandpass of our wide N-band filter., 20 pages, 8 figures, accepted for publication in the Astrophysical Journal more...
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- 2002
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10. The Disk and Environment of the Herbig B[CLC]e[/CLC] Star HD 100546
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Steven B. Kraemer, Carol A. Grady, Chuck Bowers, A. Boggess, Charles M. Telesco, Richard F. Green, Sara R. Heap, Randy A. Kimble, D. J. Lindler, Bruce E. Woodgate, Fred L. Roesler, Anthony C. Danks, Frederick C. Bruhweiler, H. W. Moos, Th. Henning, Mary Elizabeth Kaiser, Stephen P. Maran, J. B. Hutchings, Edward B. Jenkins, Elisha Polomski, Bringfried Stecklum, P. Plait, Theodore R. Gull, Mark Clampin, Robert K. Pina, D. Weistrop, J. G. Timothy, Charles L. Joseph, and J. L. Linsky more...
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Physics ,Be star ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,Herbig Ae/Be star ,Star (graph theory) ,Planetary system ,law.invention ,Telescope ,Space and Planetary Science ,Observatory ,law ,Surface brightness ,Space Telescope Imaging Spectrograph - Abstract
Coronagraphic imaging of the nearest Herbig Be star with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope, Ks (2.15 ?m) imaging with ADONIS at the 3.6 m telescope at La Silla, and mid-infrared imaging with OSCIR using the 4 m Blanco Telescope at Cerro Tololo Inter-American Observatory confirm the detection of the disk reported by Pantin et al. and map the disk out to 5'' (~515 AU) in the optical and at Ks. While the source is unresolved at 10 and 18 ?m, it can be traced to 15 at 11.7 ?m. We confirm the change in the radial dependence of the disk surface brightness near 27 seen at 1.6 ?m by Augereau et al. at Ks. No such break in the power law is seen in the optical. The STIS data reveal spiral dark lane structure, making HD 100546 the third near?zero-age main-sequence Herbig Ae/Be star with structure more than 100 AU from the star. We also optically detect a low surface brightness envelope extending 10'' (1000 AU) from the star, in addition to nebulosity, which is probably associated with DC 292.6-7.9. The survival of the envelope through essentially the entire pre?main-sequence lifetime of the star, coupled with the absence of physical companions within 1500 AU of the star, suggests that envelope lifetimes owe more to the star-forming environment than to mass-loss activity from the Herbig Ae/Be star. more...
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- 2001
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11. Deep 10 Micron Imaging of M87
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William B. Sparks, John Biretta, James T. Radomski, Chris Packham, Eric S. Perlman, R. Scott Fisher, and Robert K. Pina
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Physics ,Luminous infrared galaxy ,Jet (fluid) ,Astrophysics::High Energy Astrophysical Phenomena ,Resolution (electron density) ,Spectral density ,Synchrotron radiation ,Astronomy ,Astronomy and Astrophysics ,Torus ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,law.invention ,Core (optical fiber) ,Telescope ,Space and Planetary Science ,law ,Astrophysics::Galaxy Astrophysics - Abstract
We analyze a 10.8 ?m image of M87, obtained with the Gemini 8 m telescope + OSCIR. The image has better than 05 resolution and represents 7 hr of observing time, making it the deepest high-resolution mid-IR image ever. The core is marginally resolved, and we also detect five optically bright knots in the jet. The spectral energy distributions of these features are entirely consistent with synchrotron radiation; we find little evidence of thermal emission from a dusty torus. Four faint jet regions are below the noise level of these observations. We also find evidence for diffuse galactic emission. more...
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- 2001
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12. Mid‐Infrared Imaging of Star‐forming Regions Containing Methanol Masers
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Charles M. Telesco, Robert K. Pina, and James M. De Buizer
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Physics ,Spectrometer ,Star formation ,Young stellar object ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Position angle ,law.invention ,Telescope ,Stars ,Space and Planetary Science ,law ,Observatory ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Maser ,Astrophysics::Galaxy Astrophysics - Abstract
We present a mid-infrared imaging survey of 21 sites of massive star formation associated with methanol masers. Images were obtained from the Cerro Tololo Inter-American Observatory 4 m Blanco telescope using the University of Florida imager/spectrometer OSCIR. Of the 10 sites where the methanol masers are distributed in a linear fashion, we find three sources that are elongated at the same position angle as their linear methanol maser distributions. It is believed that these elongated mid-infrared objects are indeed circumstellar disks. It was found that the masers may arise inside the mid-infrared emitting regions of these young stellar objects, indicating that the methanol masers may be pumped by mid-infrared photons. Many mid-infrared sources in our survey have no detectable radio continuum emission, and we advance the hypothesis that these sources are lower mass, nonionizing stars. more...
- Published
- 2000
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13. Detection of Extended Thermal Infrared Emission around the Vega-like Source HD 141569
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Robert K. Pina, R. S. Fisher, Charles M. Telesco, Mark C. Wyatt, and Roger F. Knacke
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Physics ,Thermal infrared ,Space and Planetary Science ,Vega ,Astronomy ,Circumstellar dust ,Astronomy and Astrophysics ,SPHERES ,Astrophysics ,Star (graph theory) - Abstract
We report the detection of extended IR emission at 10.8 and 18.2 µm around the Vega-like source HD 141569. Mid-IR imaging with OSCIR on Keck II shows emission from dust extending out to 100 AU from the B9.5 Ve star. Our modeling of the dust places an upper limit of approximately 2 µm on the diameter of the mid-IR-emitting particles if they are Mie spheres of astronomical silicates. Comparison of our mid-IR images to the near-IR (1.1 µm) NICMOS images of HD 141569 (Weinberger et al. 1999) shows that the mid-IR emission originates at smaller distances from the star than the scattered near-IR light, as also previously observed for the archetype Vega-like source beta Pictoris. more...
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- 2000
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14. Complex Structure of η Carinae in the Mid-Infrared
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Charles M. Telesco, Robert K. Pina, Elisha Polomski, and R. Scott Fisher
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Physics ,Nebula ,Toroid ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Astronomy and Astrophysics ,Bipolar nebula ,Torus ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Protoplanetary nebula ,Photometry (optics) ,Wavelength ,Emission nebula ,Space and Planetary Science ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
We report high angular resolution observations of complex mid-infrared (4.8?18 ?m) structure in the ? Carinae Nebula. This massive (~120 M?), luminous star is surrounded by a large bipolar nebula extending as much as ~22'' in the mid-infrared. Our observations reveal the presence of several condensations within the complex core known as the Homunculus, as well as what may be a toroidal structure visible at 18 ?m. This structure may be related to a similar torus seen at near-infrared wavelengths. Our high angular resolution photometry reveals for the first time the spatial variation of the silicate feature in the nucleus of the ? Car Nebula. Finally, we present the first high-resolution mid-infrared color-temperature and optical depth maps for the nebula and discuss their significance in relation to the origin of the emission and evolutionary status of the star. more...
- Published
- 1999
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15. A Disk Census for the Nearest Group of Young Stars: Mid-Infrared Observations of the TW Hydrae Association
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Ray Jayawardhana, Giovanni G. Fazio, Robert K. Pina, Charles M. Telesco, R. Scott Fisher, and Lee Hartmann
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Physics ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics (astro-ph) ,Mid infrared ,FOS: Physical sciences ,Flux ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Thermal emission ,Circumstellar disk ,Stars ,Space and Planetary Science ,Group (periodic table) ,Astrophysics::Solar and Stellar Astrophysics ,TW Hydrae ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
A group of young, active stars in the vicinity of TW Hydrae has recently been identified as a possible physical association with a common origin. Given its proximity ($\sim$50 pc), age ($\sim$10 Myr) and abundance of binary systems, the TW Hya Association is ideally suited to studies of diversity and evolution of circumstellar disks. Here we present mid-infrared observations of 15 candidate members of the group, 11 of which have no previous flux measurements at wavelengths longer than 2$\mu$m. We report the discovery of a possible 10$\mu$m excess in CD -33$^{\circ}$7795, which may be due to a circumstellar disk or a faint, as yet undetected binary companion. Of the other stars, only TW Hya, HD 98800, Hen 3-600A, and HR 4796A -- all of which were detected by IRAS -- show excess thermal emission. Our 10$\mu$m flux measurements for the remaining members of the Association are consistent with photospheric emission, allowing us to rule out dusty inner disks. In light of these findings, we discuss the origin and age of the TW Hya Association as well as implications for disk evolution timescales., Comment: 10 pages and 1 PostScript figure, accepted for publication in The Astrophysical Journal Letters more...
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- 1999
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16. A Protocometary Cloud around HR 4796A?
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Michael Jura, Robert K. Pina, Russel White, Charles M. Telesco, R. S. Fisher, and M. A. Malkan
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Physics ,Stars ,Bright star ,Space and Planetary Science ,ROSAT ,Circumstellar dust ,Flux ,Astronomy ,Astronomy and Astrophysics ,Black-body radiation ,Radius ,Astrophysics ,Early phase - Abstract
We report both ROSAT observations and ground-based 10.8 ?m imaging of the wide binary HR 4796, which consists of a main-sequence A-type star with a large amount of circumstellar dust, HR 4796A, and, at a separation of 77, a pre-main-sequence M-type companion, HR 4796B. From the ROSAT data, we find that the X-ray emission is centered on HR 4796B, with LX/Lbol ? 3 ? 10-4. The 10.8 ?m flux, which arises from HR 4796A, displays an excess over the photospheric emission of 0.08 ? 0.02 Jy, a result consistent with the previous characterization of the emission from the circumstellar dust in the wavelength range 12 ?m ? ? ? 100 ?m as a 110 K blackbody. The Hipparcos data can be used to argue that the three main-sequence A-type stars in the Bright Star Catalogue with LIR/Lbol > 10-3 (HR 4796A, ? Pic, and 49 Cet) all have low luminosities for their colors. We argue that approximately 20% of all A-type stars pass through an early phase where they possess an amount of circumstellar dust comparable to that found around HR 4796A or ? Pic. In order to explain the result that the grain emission can be approximated by a 110 K blackbody, we propose that the circumstellar grains are largely composed of ice particles with a typical radius near 100 ?m, and that they sublimate rapidly when they are closer than ~35 AU to HR 4796A. This swarm of ice particles might be a protocometary cloud. more...
- Published
- 1998
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17. Spatio‐temporal dynamics of oscillatory heterogeneous catalysis: CO oxidation on platinum
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M. B. Maple, R. K. Pina, S. Y. Yamamoto, and Clifford M Surko
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Atmospheric pressure ,Infrared ,Analytical chemistry ,General Physics and Astronomy ,chemistry.chemical_element ,Heterogeneous catalysis ,Isothermal process ,Catalysis ,Condensed Matter::Materials Science ,chemistry ,Chemical physics ,Thermocouple ,Physics::Chemical Physics ,Physical and Theoretical Chemistry ,Thin film ,Platinum - Abstract
Reaction‐rate oscillations in the oxidation of carbon monoxide on the surface of platinum catalysts are studied in a continuous flow reactor at atmospheric pressure using infrared imaging. Small‐amplitude temperature oscillations (0.2–8 K) result in approximately isothermal conditions, where changes in rate constants, for typical activation energies and temperatures, are small. The catalysts are in the form of platinum thin films on quartz substrates and provide highly repeatable oscillatory behavior. The platinum films are fabricated in the form of annular rings which provide a quasi‐one‐dimensional geometry in order to simplify comparison to theoretical models. Time‐series measurements by means of thermocouples are used to characterize the oscillations. The infrared images show that most oscillations are spatially synchronized to within the 0.25 s time resolution of the experiment. The images also show that ‘‘fine structure’’ oscillations (i.e., small‐amplitude, high frequency oscillations superimposed on larger‐amplitude waveforms) are associated with spatially desynchronized patterns. more...
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- 1995
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18. Mid-Infrared Imaging of the First-Ascent Giant HD 233517
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Charles M. Telesco, Roger F. Knacke, Robert K. Pina, and R. Scott Fisher
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Physics ,Spectrometer ,Infrared ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,A-type main-sequence star ,Giant star ,law.invention ,Telescope ,Wavelength ,Space and Planetary Science ,Observatory ,law ,O-type main-sequence star - Abstract
We present 10.8 and 18.2 μm images of HD 233517 (K2 III) made with the Observatory Spectrometer Camera for the Infrared on Keck II. Previous observations with a 3.8 m telescope indicated that a highly inclined disk with FWHM of 15 surrounds this star, but we find that HD 233517 is unresolved in the mid-IR at the highest resolution currently possible at these wavelengths. We measure the source to have FWHM less than 031 at 10.8 μm and less than 041 at 18.2 μm. Combined with more recent analyses and conclusions by others, HD 233517 appears to be a first-ascent giant star with spatially unresolved mid-IR dust emission. more...
- Published
- 2003
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19. [Pathogenetic bases of epileptogenesis in cerebral cavernomas]
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S, Alvarez de Eulate-Beramendi, M A, Alvarez-Vega, A, Antuna-Ramos, K, Pina-Batista, J M, Jimenez-Duarte, J, Gutierrez-Morales, and A, Astudillo-Gonzalez
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Adult ,Male ,Hemangioma, Cavernous ,Matrix Metalloproteinase 9 ,Brain Neoplasms ,Seizures ,Child, Preschool ,Humans ,Female ,Endothelium, Vascular ,Hypoxia-Inducible Factor 1, alpha Subunit - Abstract
INTRODUCTION. Brain cavernoma are a type of arteriovenous malformation that clinically presenting seizures, neurological deficit or bleeding. Hypoxia, neoangiogenesis and metalloproteasas seems to be involved in seizures physiopathology. Our study aims to assess this potential relation by immunohistochemical methods, analyzing hypoxia inducible factor (HIF-1alpha) and metalloproteasa (MMP-9) in tissue surrounding cavernoma. PATIENTS AND METHODS. We selected 17 consecutive cases anatomopathologically diagnosed as cavernoma during 9 years. Immunohistochemical staining was performed for HIF-1alpha and MMP-9. We evaluated the relation between seizures and the scale of uptake of different tissues surrounding cavernoma. RESULTS. Cases with seizures had HIF-1alpha positive uptake in vascular endothelium in 31%, 17% in fibrous tissue and 34% in inflammatory tissue. Besides, it also shows MMP-9 positive uptake in vascular endothelium in 86%, 100% in fibrous tissue and 43% of brain tissue. Statistical analysis by chi-square and odds ratio shows a positive trend towards seizures and the presence of HIF-1alpha and MMP-9 in vascular tissue, fibrous tissue and brain tissue, but no for inflammatory tissue. CONCLUSION. HIF-1alpha and MMP-9, valued by immunohistochemical methods, are related to complications as seizures. more...
- Published
- 2012
20. Observations of Massive Star Forming Regions with Water Masers: Mid-Infrared Imaging
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Charles M. Telesco, James T. Radomski, Robert K. Pina, and J. M. De Buizer
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Physics ,Spectrometer ,Star formation ,Young stellar object ,Astrophysics::High Energy Astrophysical Phenomena ,Infrared telescope ,Astrophysics (astro-ph) ,Mid infrared ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,law.invention ,Telescope ,Stars ,Space and Planetary Science ,law ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Maser ,Astrophysics::Galaxy Astrophysics - Abstract
We present here a mid-infrared imaging survey of 26 sites of water maser emission. Observations were obtained at the InfraRed Telescope Facility 3-m telescope with the University of Florida mid-infrared imager/spectrometer OSCIR, and the JPL mid-infrared camera MIRLIN. The main purpose of the survey was to explore the relationship between water masers and the massive star formation process. It is generally believed that water masers predominantly trace outflows and embedded massive stellar objects, but may also exist in circumstellar disks around young stars. We investigate each of these possibilities in light of our mid-infrared imaging. We find that mid-infrared emission seems to be more closely associated with water and OH maser emission than cm radio continuum emission from UC HII regions. We also find from the sample of sources in our survey that, like groups of methanol masers, both water and OH masers have a proclivity for grouping into linear or elongated distributions. We conclude that the vast majority of linearly distributed masers are not tracing circumstellar disks, but outflows and shocks instead., 49 pages; 23 figures; To appear in February 2005 ApJS; To download a version with better quality figures, go to http://www.ctio.noao.edu/~debuizer/ more...
- Published
- 2004
21. CanariCam: a multimode mid-infrared camera for the Gran Telescopio CANARIAS
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Jim French, Mark R. Kidger, Christ Ftaclas, R. Glenn Sellar, Kevin Hanna, Charles M. Telesco, Robert K. Pina, David B. Hon, J. H. Hough, Chris Packham, Frank Varosi, J. Julian, Roger Julian, David R. Ciardi, Iye, Masanori, and Moorwood, Alan F. M. more...
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Physics ,Gran Telescopio Canarias ,business.industry ,Detector ,Polarimetry ,Polarimeter ,Field of view ,Wollaston prism ,law.invention ,Optics ,law ,Optical filter ,business ,Coronagraph - Abstract
The University of Florida is developing a mid-infrared camera for the 10.4-meter Gran Telescopio CANARIAS. CanariCam has four science modes and two engineering modes, which use the same 320 x 240-pixel, arsenic-doped silicon, blocked-impurity-band detector from Raytheon. Each mode can be remotely selected quickly during an observing sequence. The pixel scale is 0.08 arcsec, resulting in Nyquist sampling of the diffraction-limited point-spread-function at 8 μm, the shortest wavelength for which CanariCam is optimized. The total available field of view for imaging is 26 arcsec x 19 arcsec. The primary science mode will be diffraction-limited imaging using one of several available spectral filters in the 10 μm (8-14 μm) and 20 μm (16-25 μm) atmospheric windows. Any one of four plane gratings can be inserted for low and moderate-resolution (R = 100 - 1300) slit spectroscopy in the 10 and 20-μm regions. Insertion of appropriate field and pupil stops converts the camera into a coronagraph, while insertion of an internal rotating half-wave plate, a field mask, and a Wollaston prism converts the camera into a dual-beam polarimeter. more...
- Published
- 2003
22. Mid-Infrared Imaging of the Protostellar Binary L1448N--IRS3(A,B)
- Author
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R. Scott Fisher, Jonathan Williams, James T. Radomski, Charles M. Telesco, Chris Packham, David R. Ciardi, and Robert K. Pina
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Physics ,Astrophysics (astro-ph) ,Mid infrared ,FOS: Physical sciences ,Binary number ,Astronomy and Astrophysics ,Astrophysics ,01 natural sciences ,Luminosity ,Space and Planetary Science ,0103 physical sciences ,Protostar ,Binary system ,010306 general physics ,010303 astronomy & astrophysics ,Envelope (waves) - Abstract
Mid-infrared (10-25 \micron) imaging of the protostellar binary system L1448N-IRS3(A,B) is presented. Only one source, IRS3(A), was detected at mid-infrared wavelengths -- all of the mid-infrared emission from IRS3(A,B) emanates from IRS3(A). The mid-infrared luminosity of IRS3(A) is $L_{midir} = 1.3(\frac{d}{300\rm{pc}})^2 L_\sun$, which yields a central source mass, depending on the mass infall rate, of $M_* = 0.2 M_\sun \frac{10^{-6}M_\sun yr^{-1}}{\dot M}$. The envelope mass surrounding IRS3(A) is $\sim 0.15 M_\sun$, suggesting that the central source and the envelope are of comparable mass. The locations of IRS3(A) and IRS3(B) on an $M_{env} - L_{bol}$ diagram indicate that IRS3(A) and IRS3(B) appear to be class I and class 0 protostars, respectively., Accepted for publication in The Astrophysical Journal more...
- Published
- 2002
23. Mid-Infrared Imaging of NGC 6334 I
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James M. De Buizer, James T. Radomski, Robert K. Pina, and Charles M. Telesco
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Physics ,Infrared ,Continuum (design consultancy) ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Position angle ,law.invention ,Interstellar medium ,Wavelength ,Space and Planetary Science ,law ,Coincident ,Astrophysics::Solar and Stellar Astrophysics ,Bow shock (aerodynamics) ,Astrophysics::Earth and Planetary Astrophysics ,Maser ,Astrophysics::Galaxy Astrophysics - Abstract
We present high-resolution (, Accepted for publication by the Astrophysical Journal, 27 pages, 9 figures
- Published
- 2002
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24. Mid-Infrared Detection of a Hot Molecular Core in G29.96-0.02
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Charles M. Telesco, Alan M. Watson, Robert K. Pina, James T. Radomski, and James M. De Buizer
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Physics ,Spectrometer ,Física, Astronomía y Matemáticas ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,law.invention ,Core (optical fiber) ,Telescope ,Wavelength ,Space and Planetary Science ,Observatory ,law ,Coincident ,Angular resolution ,Maser - Abstract
We present high angular resolution (~0.5") 10 and 18 micron images of the region around G29.96-0.02 taken from the Gemini North 8-m telescope using the mid-infrared imager and spectrometer OSCIR. These observations were centered on the location of a group of water masers, which delineate the site of a hot molecular core believed to contain an extremely young, massive star. We report here the direct detection of a hot molecular core at mid-infrared wavelengths at this location. The size and extent of the core at 18 microns appears to be very similar to the morphology as seen in integrated NH3 maps. However, our observations indicate that the mid-infrared emission may not be exactly coincident with the NH3 emission., 12 pages, 3 figures, accepted for publication in ApJ Letters more...
- Published
- 2001
25. High-Resolution Mid-Infrared Imaging of G339.88-1.26
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Andrew Walsh, Chris Phillips, James M. De Buizer, Robert K. Pina, and Charles M. Telesco
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Physics ,H II region ,Spectrometer ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics (astro-ph) ,High resolution ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Position angle ,law.invention ,Space and Planetary Science ,law ,Observatory ,Astrophysics::Solar and Stellar Astrophysics ,Outflow ,Astrophysics::Earth and Planetary Astrophysics ,Maser ,Second source ,Astrophysics::Galaxy Astrophysics - Abstract
G339.88-1.26 is considered to be a good candidate for a massive star with a circumstellar disk. This has been supported by the observations of linearly distributed methanol maser spots believed to delineate this disk, and mid-infrared observations that have discovered a source at this location that is elongated at the same position angle as the methanol maser distribution. We used the mid-infrared imager/spectrometer OSCIR at Keck to make high-resolution images of G339.88-1.26. We resolve the mid-infrared emission into 3 sources within 1.5 arcsec of the location of the masers. We determine that the methanol masers are most likely not located in a circumstellar disk. Furthermore we find that the observed radio continuum emission most likely comes from two sources in close proximity to each other. One source is an unobscured massive star with an extended HII region that is responsible for the peak in the radio continuum emission. A second source is embedded and centered on the elongation in the radio continuum emission that is believed to be tracing an outflow in this region., Comment: 12 pages, 2 figures, Accepted for publication in ApJ more...
- Published
- 2001
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26. Mid-Infrared Imaging of Candidate Vega-Like Systems
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Giovanni G. Fazio, Lee Hartmann, Robert K. Pina, R. Scott Fisher, Charles M. Telesco, David Barrado y Navascués, and Ray Jayawardhana
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Physics ,Infrared ,Astrophysics (astro-ph) ,Mid infrared ,Vega ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Wavelength ,Stars ,Disk size ,Space and Planetary Science ,Primary (astronomy) ,Main sequence - Abstract
We have conducted deep mid-infrared imaging of a relatively nearby sample of candidate Vega-like stars using the OSCIR instrument on the CTIO 4-meter and Keck II 10-meter telescopes. Our discovery of a spatially-resolved disk around HR 4796A has already been reported (Jayawardhana et al. 1998). Here we present imaging observations of the other members of the sample, including the discovery that only the primary in the HD 35187 binary system appears to harbor a substantial circumstellar disk and the possible detection of extended disk emission around 49 Ceti. We derive global properties of the dust disks, place constraints on their sizes, and discuss several interesting cases in detail. Although our targets are believed to be main sequence stars, we note that several have large infrared excesses compared to prototype Vega-like systems, and may therefore be somewhat younger. The disk size constraints we derive, in many cases, imply emission from relatively large ($\gtrsim$ 10$\mu$m) particles at mid-infrared wavelengths., Comment: 15 pages and 2 PostScript figures, accepted for publication in The Astronomical Journal more...
- Published
- 2001
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27. A Mid-Infrared Study of the Young Stellar Population in the NGC 2024 Cluster
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Elizabeth A. Lada, Robert K. Pina, Karl E. Haisch, Charles M. Telesco, and Charles J. Lada
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Physics ,Infrared excess ,Stellar population ,Young stellar object ,Astrophysics (astro-ph) ,Extinction (astronomy) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Photometry (optics) ,Stars ,Space and Planetary Science ,Cluster (physics) ,Protostar - Abstract
We present the results of the first broadband 10.8 um survey of the NGC 2024 cluster. The mid-infrared data were combined with our previously published JHKL photometry in order to construct spectral energy distributions for all detected sources. The main scientific goals were to investigate the nature of the young stellar objects (YSOs) in the cluster, and to examine the efficiency of detecting circumstellar disk sources from near-infrared JHKL color-color diagrams. Out of 59 sources surveyed having K-band magnitudes K < 10.5, we detected 35 (~59%) at 10 um. Combining these detections, and upper limits for the non-detections, with existing JHKL data, we identify 1 Class I, 6 flat spectrum, 28 Class II and 5 Class III sources. We find a circumstellar disk fraction for NGC 2024 of ~85% +/- 15%, which confirms earlier published suggestions that the majority, if not all, of the stars in NGC 2024 formed with disks, and these disks still exist at the present time. In addition, all but one of the disk sources identified in our survey lie in the infrared excess region of the JHKL color-color diagram for the cluster. This demonstrates that JHKL color-color diagrams are extremely efficient in identifying YSOs with disks. Of the 14 sources with K - L colors suggestive of protostellar objects, \~29% are protostellar in nature, while ~7% are true Class I YSOs. This may be due to extinction producing very red K - L colors in Class II YSOs, thus making them appear similar in color to protostars. This suggests caution must be applied when estimating the sizes and lifetimes of protostellar populations within star forming regions based on K - L colors alone. Finally, we calculate the luminosities of the Class II YSOs in NGC 2024, rho Oph and Taurus and discuss the results., 30 pages, 8 figures, paper to appear in March AJ more...
- Published
- 2000
28. Keck Diffraction-Limited Imaging of the Young Quadruple Star System HD 98800
- Author
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Paul J. Stomski, Andrea M. Ghez, Peter Wizinowich, Olivier Lai, Robert K. Pina, D. S. Acton, Charles M. Telesco, Lisa Prato, and R. S. Fisher
- Subjects
Diffraction ,Physics ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Radius ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Orbital mechanics ,Speckle pattern ,Wavelength ,Space and Planetary Science ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Circumbinary planet ,Adaptive optics ,Astrophysics::Galaxy Astrophysics ,Visual binary - Abstract
This paper presents diffraction-limited 1-18 micron images of the young quadruple star system HD 98800 obtained with the W. M. Keck 10-m telescopes using speckle and adaptive optics imaging at near-IR wavelengths and direct imaging at mid-IR wavelengths. The two components of the visual binary, A and B, both themselves spectroscopic binaries, were separable at all wavelengths, allowing us to determine their stellar and circumstellar properties. Combining these observations with spectroscopic data from the literature, we derive an age of 10 Myr, masses of 0.93 and 0.64 M_sun and an inclination angle of 58 deg for the spectroscopic components of HD 98800 B, and an age of 10 Myr and a mass of 1.1 M_sun for HD 98800 Aa. Our data confirm that the large mid-IR excess is entirely associated with HD 98800 B. This excess exhibits a black body temperature of 150 K and a strong 10 micron silicate emission feature. The theoretical equilibrium radius of large, perfectly absorbing, 150 K grains around HD 98800 B is 2.4 AU, suggesting a circum-spectroscopic binary distribution. Our observations set important upper limits on the size of the inner dust radius of ~2 AU (mid-IR data) and on the quantity of scattered light of 2 microns. The total mass of the dust, located in a circumbinary disk around the HD 98800 B, is >0.002 M_earth. The orbital dynamics of the A-B pair are likely responsible for the disk geometry., 27 pages, 4 tables, 9 figures; small revisions to section 3.2.4 more...
- Published
- 2000
29. Deep 10 and 18 micron Imaging of the HR 4796A Circumstellar Disk: Transient Dust Particles & Tentative Evidence for a Brightness Asymmetry
- Author
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K. Grogan, Stanley F. Dermott, Ray Jayawardhana, E. K. Holmes, Lisa Prato, Lee Hartmann, Mark C. Wyatt, Charles M. Telesco, Andrea M. Ghez, R. S. Fisher, Roger F. Knacke, and Robert K. Pina
- Subjects
Physics ,Brightness ,media_common.quotation_subject ,Astronomy and Astrophysics ,Astrophysics ,Radius ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Radiation ,Asymmetry ,Radiation pressure ,Space and Planetary Science ,Planet ,Annulus (firestop) ,Particle ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Galaxy Astrophysics ,media_common - Abstract
We present new 10.8 and 18.2 micron images of HR 4796A, a young A0V star that was recently discovered to have a spectacular, nearly edge-on, circumstellar disk prominent at ~20 microns (Jayawardhana et al. 1998; Koerner et al. 1998). These new images, obtained with OSCIR at Keck II, show that the disk's size at 10 microns is comparable to its size at 18 microns. Therefore, the 18 micron-emitting dust may also emit some, or all, of the 10 micron radiation. Using these multi-wavelength images, we determine a "characteristic" diameter of 2-3 microns for the mid-infrared-emitting dust particles if they are spherical and composed of astronomical silicates. Particles this small are expected to be blown out of the system by radiation pressure in a few hundred years, and therefore these particles are unlikely to be primordial. Dynamical modeling of the disk (Wyatt et al. 2000) indicates that the disk surface density is relatively sharply peaked near 70 AU, which agrees with the mean annular radius deduced by Schneider et al. (1999) from their NICMOS images. We present evidence (~1.8 sigma significance) for a brightness asymmetry that may result from the presence of the hole and the gravitational perturbation of the disk particle orbits by the low-mass stellar companion or a planet. This "pericenter glow," which must still be confirmed, results from a very small (a few AU) shift of the disk's center of symmetry relative to the central star HR 4796A; one side of the inner boundary of the annulus is shifted towards HR 4796A, thereby becoming warmer and more infrared-emitting. The possible detection of pericenter glow implies that the detection of even complex dynamical effects of planets on disks is within reach., Comment: 18 pages. 9 GIF images. Total size ~800 kB. High resolution images available upon request. Accepted for publication in the Astrophysical Journal (scheduled for January 10, 2000) more...
- Published
- 1999
30. How Observations of Circumstellar Disk Asymmetries Can Reveal Hidden Planets: Pericenter Glow and its Application to the HR 4796 Disk
- Author
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Stanley F. Dermott, Charles M. Telesco, Robert K. Pina, E. K. Holmes, K. Grogan, R. S. Fisher, and Mark C. Wyatt
- Subjects
Physics ,Brightness ,media_common.quotation_subject ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Orbital eccentricity ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Asymmetry ,Gravitation ,Stars ,Fomalhaut ,Space and Planetary Science ,Planet ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Eccentricity (behavior) ,Astrophysics::Galaxy Astrophysics ,media_common - Abstract
Recent images of the disks of dust around the young stars HR 4796A and Fomalhaut show, in each case, a double-lobed feature that may be asymmetric (one lobe may be brighter than the other). A symmetric double-lobed structure is that expected from a disk of dust with a central hole that is observed nearly edge-on (i.e., close to the plane of the disk). This paper shows how the gravitational influence of a second body in the system with an eccentric orbit would cause a brightness asymmetry in such a disk by imposing a "forced eccentricity" on the orbits of the constituent dust particles, thus shifting the center of symmetry of the disk away from the star and causing the dust near the forced pericenter of the perturbed disk to glow. Dynamic modeling of the HR 4796 disk shows that its 5% brightness asymmetry could be the result of a forced eccentricity as small as 0.02 imposed on the disk by either the binary companion HR 4796B, or by an unseen planet close to the inner edge of the disk. Since it is likely that a forced eccentricity of 0.01 or higher would be imposed on a disk in a system in which there are planets, but no binary companion, the corresponding asymmetry in the disk's structure could serve as a sensitive indicator of these planets that might otherwise remain undetected., Comment: 61 pages, 10 figures, accepted for publication in the Astrophysical Journal (scheduled for January 10, 2000) more...
- Published
- 1999
- Full Text
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31. Mid-infrared imaging of the young binary star Hen 3-600: Evidence for a dust disk around the primary
- Author
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Ray Jayawardhana, Giovanni G. Fazio, Lee Hartmann, Robert K. Pina, Charles M. Telesco, and R. Scott Fisher
- Subjects
Physics ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Stars ,T Tauri star ,Space and Planetary Science ,Primary (astronomy) ,Binary star ,Circumstellar dust ,TW Hydrae ,Spectral energy distribution ,Binary system - Abstract
We present high-resolution mid-infrared observations of the nearby late-type young binary system Hen 3-600. The binary, at a distance of $\sim$ 50 pc, could be a member of the TW Hydrae Association, the nearest known group of young stars, with an age of a few million years. Our images make it possible for the first time to determine which star in the pair, separated by 1.4'', harbors the mid-infrared excess detected by IRAS. In the near-infrared, where the radiation is primarily photospheric, Hen 3-600A (M3) and Hen 3-600B (M3.5) have a flux ratio of 1.6. At 4.8$\mu$m, 10.8$\mu$m, and 18.2$\mu$m, the primary becomes increasingly dominant over the secondary, suggesting that most of the circumstellar dust in the system resides around Hen 3-600A. Comparison of the spectral energy distribution (SED) of Hen 3-600A to the median SED of classical T Tauri stars suggests that its disk may be truncated by the secondary and provides tentative evidence for a central disk hole. The distribution of dust in the Hen 3-600 system may provide important clues to the formation and evolution of protoplanetary disks in close binaries., Comment: 9 pages, 2 PostScript figures, accepted for publication in The Astrophysical Journal Letters more...
- Published
- 1999
- Full Text
- View/download PDF
32. Preliminary optical design of AIRES: an airborne infrared echelle spectrometer for SOFIA
- Author
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James A. Baltz, Michael R. Haas, James P. McGuire, Charles M. Telesco, Sean W. J. Colgan, Thomas L. Roellig, Edwin F. Erickson, Juergen Wolf, Robert K. Pina, Dana H. Lynch, Janet P. Simpson, and Erick T. Young more...
- Subjects
Physics ,Infrared astronomy ,Spectrometer ,business.industry ,law.invention ,Interstellar medium ,Telescope ,Imaging spectroscopy ,Cardinal point ,Optics ,Observatory ,law ,Blazed grating ,business ,Remote sensing - Abstract
NASA's Stratospheric Observatory for IR Astronomy (SOFIA) will enable unprecedented IR acuity at wavelengths obscured from the ground. To help open this new chapter in the exploration of the IR universe, we are developing the Airborne IR Echelle Spectrometer (AIRES) as a facility science instrument. Full funding was awarded for a four year development in October, 1997. The instrument is scheduled to come on-line with the observatory in the Fall of 2001. It will be used to investigate a broad range of phenomena that occur in the interstellar medium. AIRES will use a 1200 mm long, 76 degree blaze angle echelle to combine high resolution spectroscopy with diffraction-limited imaging in the cross-dispersion direction. Its three 2D detector arrays will prove good sensitivity over a decade in wavelength. An additional array will be used as a slit viewer for (lambda) more...
- Published
- 1998
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- View/download PDF
33. GatirCam: Gemini mid-infrared imager
- Author
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Thomas M. Kisko, Charles M. Telesco, J. Julian, Robert K. Pina, Kevin Hanna, and David B. Hon
- Subjects
Gemini Observatory ,Telescope ,Design studies ,Optics ,Image quality ,business.industry ,law ,Mid infrared ,Environmental science ,Key features ,business ,Remote sensing ,law.invention - Abstract
The University of Florida is developing the mid-IR imager, called GatirCam, to be used primarily, but not solely, at the southern hemisphere Gemini telescope at Cerro Pachon, Chile. Key features of GatirCam are its fully reflective optics, its very high mechanical rigidity, and the fact that the associated electronics are very similar to those is in use successfully on similar instrumentation. Design studies for GatirCam indicate that it will meet or exceed all critical requirements of image quality and performance. A low-resolution spectroscopic mode is also currently under consideration for implementation in GatirCam. more...
- Published
- 1998
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34. A dust disk surrounding the young A star HR4796A
- Author
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Giovanni G. Fazio, Robert K. Pina, Charles M. Telesco, Lee Hartmann, Ray Jayawardhana, and Scott Fisher
- Subjects
Physics ,Solar System ,Orbital plane ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Position angle ,Accretion (astrophysics) ,Stars ,T Tauri star ,Space and Planetary Science ,Planet ,Astrophysics::Solar and Stellar Astrophysics ,Surface brightness ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
We report the codiscovery of the spatially-resolved dust disk of the Vega-like star HR 4796A. Images of the thermal dust emission at $\lambda = 18 \mu$m show an elongated structure approximately 200 AU in diameter surrounding the central A0V star. The position angle of the disk, $30^{\circ} \pm 10^{\circ}$, is consistent to the position angle of the M companion star, $225^{\circ}$, suggesting that the disk-binary system is being seen nearly along its orbital plane. The surface brightness distribution of the disk is consistent with the presence of an inner disk hole of approximately 50 AU radius, as was originally suggested by Jura et al. on the basis of the infrared spectrum. HR 4796 is a unique system among the Vega-like or $\beta$ Pictoris stars in that the M star companion (a weak-emission T Tauri star) shows that the system is relatively young, $\sim 8 \pm 3$ Myr. The inner disk hole may provide evidence for coagulation of dust into larger bodies on a timescale similar to that suggested for planet formation in the solar system., Comment: 12 pages, 3 PostScript figures, accepted for publication in Astrophysical Journal Letters more...
- Published
- 1998
35. Pulse Propagation in the Catalytic Oxidation of Carbon Monoxide on Platinum
- Author
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Clifford M Surko, M. B. Maple, S. Y. Yamamoto, and R. K. Pina
- Subjects
Materials science ,Atmospheric pressure ,Analytical chemistry ,General Physics and Astronomy ,chemistry.chemical_element ,Chemical reaction ,Isothermal process ,Pulse (physics) ,Condensed Matter::Materials Science ,chemistry.chemical_compound ,chemistry ,Annulus (firestop) ,Thin film ,Platinum ,Carbon monoxide - Abstract
Infrared imaging is used to measure the spatiotemporal patterns associated with the oscillatory oxidation of carbon monoxide on the surface of polycrystalline platinum thin films at atmospheric pressure. An annular geometry restricts the dynamics to be quasi-one-dimensional, and the amplitude of the temperature oscillations is small (0.35 K), so that the reaction conditions are approximately isothermal. A propagating pulse is observed which rotates around the annulus. To our knowledge, this is the first observation of pulse propagation in this chemical reaction at atmospheric pressure. more...
- Published
- 1995
36. Pixon-based Multiresolution Image Reconstruction for Yohkoh's Hard X-Ray Telescope
- Author
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Thomas R. Metcalf, Hugh S. Hudson, Takeo Kosugi, R. C. Puetter, and R. K. Pina
- Subjects
Space and Planetary Science ,Astronomy and Astrophysics - Published
- 1996
- Full Text
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37. Synthesis and spectral properties of 1-aryl-2-formylpyrroles
- Author
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Yu. G. Bundel, M. Rodriges, V. A. Budylin, K. Pina, P. B. Terent'ev, and M. del
- Subjects
chemistry.chemical_compound ,Schiff base ,Aniline ,chemistry ,Aryl ,Organic Chemistry ,Spectral properties ,Organic chemistry - Abstract
Various 1-aryl-2-formylpyrroles were synthesized by reaction of furfurol with substituted anilines. For p-bromo- and p-chlorophenylsubstituents, the intermediate Schiff bases were isolated.
- Published
- 1989
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38. Spatial structure of derivatives of 1-nitrophenylpyrroles
- Author
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M. Rodriges, K. Pina, M. del, Yu. G. Bundel, and V. A. Budylin
- Subjects
chemistry.chemical_classification ,chemistry.chemical_compound ,Spatial structure ,Chemistry ,Amide ,Organic Chemistry ,Organic chemistry ,Carbon-13 NMR ,Aldehyde - Abstract
Combined 1H and 13C NMR data were used to show that 2-carbonyl derivatives of 1-nitrophenylpyrroles (aldehydes, acids, esters, and amides) have primarily the S-trans-configuration. Oximes of 1-nitrophenyl-2-formylpyrroles exist as a mixture of S-trans-syn- and S-cis-anti-isomers. more...
- Published
- 1989
- Full Text
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39. Current status of chemotherapy in the treatment of advanced carcinoma of the thyroid gland
- Author
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D S, Poster, S, Bruno, J, Penta, K, Pina, and R, Catane
- Subjects
Humans ,Drug Therapy, Combination ,Thyroid Neoplasms - Abstract
An extensive review of the literature was undertaken to identify single agents and chemotherapeutic combinations active against advanced thyroid carcinoma. The two most intensively studied agents were Adriamycin and bleomycin, both of which appear to have definite activity against advanced disease. Studies of 25 other single agents and 17 drug combinations were also reviewed but most of the studies suffered from extremely poor patient accrual, thus precluding statistical analysis. Two cooperative group protocols are in progress which will hopefully accrue enough patients for meaningful interpretation. Physicians treating advanced thyroid carcinoma patients are urged to participate in these studies. more...
- Published
- 1981
40. ChemInform Abstract: ACID ISOMERIZATION OF 2-FORMYLPYRROLES
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V. A. Budylin, Yu. G. Bundel, and M. Del K. Pina
- Subjects
Chemistry ,General Medicine ,Photochemistry ,Isomerization - Published
- 1984
- Full Text
- View/download PDF
41. Let's Talk About Antibiotics: a randomised trial of two interventions to reduce antibiotic misuse.
- Author
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Goggin K, Hurley EA, Lee BR, Bradley-Ewing A, Bickford C, Pina K, Donis de Miranda E, Yu D, Weltmer K, Linnemayr S, Butler CC, Newland JG, and Myers AL
- Subjects
- Humans, Female, Male, Infant, Child, Preschool, Inappropriate Prescribing prevention & control, Prescriptions, Communication, Anti-Bacterial Agents therapeutic use, Respiratory Tract Infections drug therapy
- Abstract
Background: Children with acute respiratory tract infections (ARTIs) receive ≈11.4 million unnecessary antibiotic prescriptions annually. A noted contributor is inadequate parent-clinician communication, however, efforts to reduce overprescribing have only indirectly targeted communication or been impractical., Objectives: Compare two feasible (higher vs lower intensity) interventions for enhancing parent-clinician communication on the rate of inappropriate antibiotic prescribing., Design: Multisite, parallel group, cluster randomised comparative effectiveness trial. Data collected between March 2017 and March 2019., Setting: Academic and private practice outpatient clinics., Participants: Clinicians (n=41, 85% of eligible approached) and 1599 parent-child dyads (ages 1-5 years with ARTI symptoms, 71% of eligible approached)., Interventions: All clinicians received 20 min ARTI diagnosis and treatment education. Higher intensity clinicians received an additional 50 min communication skills training. All parents viewed a 90 second antibiotic education video., Main Outcomes and Measures: Inappropriate antibiotic treatment was assessed via blinded medical record review by study clinicians and a priori defined as prescriptions for the wrong diagnosis or use of the wrong agent. Secondary outcomes were revisits, adverse drug reactions (both assessed 2 weeks after the visit) and parent ratings of provider communication, shared decision-making and visit satisfaction (assessed at end of the visit on Likert-type scales)., Results: Most clinicians completed the study (n=38, 93%), were doctors (n=25, 66%), female (n=30, 78%) and averaged 8 years in practice. All parent-child dyad provided data for the main outcome (n=855 (54%) male, n=1043 (53%) < 2 years). Inappropriate antibiotic prescribing was similar among patients who consulted with a higher intensity (54/696, 7.8%) versus a lower intensity (85/904, 9.4%) clinician. A generalised linear mixed effect regression model (adjusted for the two-stage nested design, clinician type, clinic setting and clinician experience) revealed that the odds of receiving inappropriate antibiotic treatment did not significantly vary by group (AOR 0.99, 95% CI: 0.52 to 1.89, p=0.98). Secondary outcomes of revisits and adverse reactions did not vary between arms, and parent ratings of satisfaction with quality of parent-provider communication (5/5), shared decision making (9/10) and visit satisfaction (5/5) were similarly high in both arms., Conclusions and Relevance: Rate of inappropriate prescribing was low in both arms. Clinician education coupled with parent education may be sufficient to yield low inappropriate antibiotic prescribing rates. The absence of a significant difference between groups indicates that communication principles previously thought to drive inappropriate prescribing may need to be re-examined or may not have as much of an impact in practices where prescribing has improved in recent years., Trial Registration Number: NCT03037112., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.) more...
- Published
- 2022
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42. Designing an Adaptive Adolescent Physical Activity and Nutrition Intervention for COVID-19-Related Health Challenges: Formative Research Study.
- Author
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Grimes A, Lightner JS, Pina K, Donis de Miranda ES, Meissen-Sebelius E, Shook RP, and Hurley EA
- Abstract
Background: With rates of childhood obesity continually increasing, effective physical activity and nutrition interventions are needed. Formative research is used to tailor interventions to different cultural and geographic contexts and can be vital in adapting intervention strategies in the face of significant disruptive circumstances (like COVID-19)., Objective: We conducted formative research via in-person and web-based focus groups among middle schoolers and parents to better understand the facilitators and barriers to physical activity and fruit and vegetable consumption and to inform the design of a large intervention for a low-income, urban setting in the US Midwest., Methods: We conducted 2 phases of qualitative focus groups with parents (n=20) and 6th-9th grade middle schoolers (n=23). Phase 1 was conducted prior to the COVID-19 pandemic in late 2019, and phase 2 was conducted during the COVID-19 pandemic in the summer of 2020. Focus groups were transcribed and thematically coded using the Dedoose software., Results: The main facilitators of physical activity prior to the pandemic included the opportunity to have fun, peer influence, competition (for some), and incentives, while the main barriers to physical activity were time constraints and social discomfort. The main facilitators of eating fruits and vegetables included parental influence, preparation technique, and convenience, while barriers included dislike of vegetables, time constraints, and preparation or freshness. During the pandemic, facilitators of physical activity remained the same, while additional barriers to physical activity such as lack of motivation and limited time spent outside of the home were reported. For fruit and vegetable consumption, both facilitators and barriers remained the same for both time periods. Additionally, for some participants, the pandemic offered an opportunity to offer more fruits and vegetables to middle schoolers throughout the day., Conclusions: Some themes identified were common to those reported in previous studies, such as peer influence on physical activity and parental influence on fruit and vegetable consumption. Novel themes such as lack of motivation to be active and limited time outside the home helped improve intervention adaptation, specifically during the COVID-19 pandemic. The continuity of formative research after a major unexpected change in the intervention context can be essential in targeting areas of an intervention that can be retained and those that need to be adjusted., (©Amanda Grimes, Joseph S Lightner, Kimberly Pina, Evelyn S Donis de Miranda, Emily Meissen-Sebelius, Robin P Shook, Emily A Hurley. Originally published in JMIR Formative Research (https://formative.jmir.org), 21.01.2022.) more...
- Published
- 2022
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43. Demographic Characteristics Among Members of Patient Family Advisory Councils at a Pediatric Health System.
- Author
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Montalbano A, Chadwick S, Miller D, Taff K, De Miranda ED, Pina K, and Bradley-Ewing A
- Abstract
Patient Family Advisory Councils (PFACs) are groups of patients, families, and clinical health system leaders collaborating to improve the quality, safety, and experience of care. Best practices encourage PFAC membership to reflect the diversity of the communities served. A cross-sectional survey was conducted from September 2019 to January 2020 collecting demographic characteristics of the members of a pediatric health system's 17 PFACs. Of the 93 respondents (71.5%), notable inequities were racial (4.8% adult PFAC members vs. 17.4% patients were Black) and financial (adult PFAC median annual income was >$100,000 compared to the community median $77,589). The governing family advisory board used this information to codesign interventions to achieve the ideal state of inclusive excellence by identifying barriers for participation for the Black community, recruiting and retaining diverse board members, and continuous monitoring to maintain a diverse board representation., Competing Interests: Declaration of Conflicting Interests: The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (© The Author(s) 2021.) more...
- Published
- 2021
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44. Reductions in Parent Interest in Receiving Antibiotics following a 90-Second Video Intervention in Outpatient Pediatric Clinics.
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Goggin K, Hurley EA, Bradley-Ewing A, Bickford C, Lee BR, Pina K, De Miranda ED, Mackenzie A, Yu D, Weltmer K, Linnemayr S, Butler CC, Miller M, Newland JG, and Myers AL
- Subjects
- Adolescent, Adult, Ambulatory Care statistics & numerical data, Child, Preschool, Female, Health Knowledge, Attitudes, Practice, Humans, Infant, Male, Middle Aged, Respiratory Tract Infections drug therapy, Surveys and Questionnaires, Young Adult, Anti-Bacterial Agents therapeutic use, Parents psychology, Patient Education as Topic methods, Video Recording
- Abstract
Objectives: To assess the impact of a 90-second animated video on parents' interest in receiving an antibiotic for their child., Study Design: This pre-post test study enrolled English and Spanish speaking parents (n = 1051) of children ages 1-5 years presenting with acute respiratory tract infection symptoms. Before meeting with their provider, parents rated their interest in receiving an antibiotic for their child, answered 6 true/false antibiotic knowledge questions, viewed the video, and then rated their antibiotic interest again. Parents rated their interest in receiving an antibiotic using a visual analogue scale ranging from 0 to 100, with 0 being "I definitely do not want an antibiotic," 50 "Neutral," and 100 "I absolutely want an antibiotic.", Results: Parents were 84% female, with a mean age of 32 ± 6.0, 26.0% had a high school education or less, 15% were black, and 19% were Hispanic. After watching the video, parents' average antibiotic interest ratings decreased by 10 points (mean, 57.0 ± 20 to M ± 21; P < .0001). Among parents with the highest initial antibiotic interest ratings (≥60), even greater decreases were observed (83.0 ± 12.0 to 63.4 ± 22; P < .0001) with more than one-half (52%) rating their interest in the low or neutral ranges after watching the video., Conclusions: A 90-second video can decrease parents' interest in receiving antibiotics, especially among those with higher baseline interest. This scalable intervention could be used in a variety of settings to reduce parents' interest in receiving antibiotics., Trial Registration: ClinicalTrials.gov: NCT03037112., (Copyright © 2020 Elsevier Inc. All rights reserved.) more...
- Published
- 2020
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45. The importance of fathers in pediatric research: These authors are on to something important.
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Davis AM, Canter KS, and Pina K
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- Adult, Body Mass Index, Child, Humans, Male, Biomedical Research, Father-Child Relations, Fathers psychology, Pediatric Obesity therapy
- Abstract
Pediatric obesity remains a prevalent health issue in the United States and around the world. Treatments are challenged by a lack of meaningful improvements in child healthy weight. The current commentary describes an intervention study with a unique approach: engaging fathers. The commentary describes why this approach is unique and promising in terms of future directions for the field to consider., (© The Author(s) 2019. Published by Oxford University Press on behalf of the Society of Behavioral Medicine. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.) more...
- Published
- 2019
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46. Protocol for a randomised trial of higher versus lower intensity patient-provider communication interventions to reduce antibiotic misuse in two paediatric ambulatory clinics in the USA.
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Goggin K, Bradley-Ewing A, Myers AL, Lee BR, Hurley EA, Delay KB, Schlachter S, Ramphal A, Pina K, Yu D, Weltmer K, Linnemayr S, Butler CC, and Newland JG
- Subjects
- Child, Preschool, Clinical Protocols, Female, Humans, Infant, Male, Primary Health Care methods, Randomized Controlled Trials as Topic, Research Design, Ambulatory Care Facilities, Anti-Bacterial Agents, Health Communication methods, Inappropriate Prescribing prevention & control, Practice Patterns, Physicians' statistics & numerical data, Respiratory Tract Infections therapy
- Abstract
Introduction: Children with acute respiratory tract infections (ARTIs) are prescribed up to 11.4 million unnecessary antibiotic prescriptions annually. Inadequate parent-provider communication is a chief contributor, yet efforts to reduce overprescribing have only indirectly targeted communication or been impractical. This paper describes our multisite, parallel group, cluster randomised trial comparing two feasible interventions for enhancing parent-provider communication on the rate of inappropriate antibiotic prescribing (primary outcome) and revisits, adverse drug reactions and parent-rated quality of shared decision-making, parent-provider communication and visit satisfaction (secondary outcomes)., Methods/analysis: We will attempt to recruit all eligible paediatricians and nurse practitioners (currently 47) at an academic children's hospital and a private practice. Using a 1:1 randomisation, providers will be assigned to a higher intensity education and communication skills or lower intensity education-only intervention and trained accordingly. We will recruit 1600 eligible parent-child dyads. Parents of children ages 1-5 years who present with ARTI symptoms will be managed by providers trained in either the higher or lower intensity intervention. Before their consultation, all parents will complete a baseline survey and view a 90 s gain-framed antibiotic educational video. Parent-child dyads consulting with providers trained in the higher intensity intervention will, in addition, receive a gain-framed antibiotic educational brochure promoting cautious use of antibiotics and rate their interest in receiving an antibiotic which will be shared with their provider before the visit. All parents will complete a postconsultation survey and a 2-week follow-up phone survey. Due to the two-stage nested design (parents nested within providers and clinics), we will employ generalised linear mixed-effect regression models., Ethics/dissemination: Ethical approval was obtained from the Children's Mercy Hospital Pediatric Institutional Review Board (#16060466). Results will be submitted for publication in peer-reviewed journals., Trial Registration Number: NCT03037112; Pre-results., Competing Interests: Competing interests: None declared., (© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted.) more...
- Published
- 2018
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47. [Pathogenetic bases of epileptogenesis in cerebral cavernomas].
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Alvarez de Eulate-Beramendi S, Alvarez-Vega MA, Antuna-Ramos A, Pina-Batista K, Jimenez-Duarte JM, Gutierrez-Morales J, and Astudillo-Gonzalez A
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- Adult, Child, Preschool, Endothelium, Vascular chemistry, Female, Humans, Hypoxia-Inducible Factor 1, alpha Subunit analysis, Male, Matrix Metalloproteinase 9 analysis, Brain Neoplasms complications, Hemangioma, Cavernous complications, Seizures etiology
- Abstract
INTRODUCTION. Brain cavernoma are a type of arteriovenous malformation that clinically presenting seizures, neurological deficit or bleeding. Hypoxia, neoangiogenesis and metalloproteasas seems to be involved in seizures physiopathology. Our study aims to assess this potential relation by immunohistochemical methods, analyzing hypoxia inducible factor (HIF-1alpha) and metalloproteasa (MMP-9) in tissue surrounding cavernoma. PATIENTS AND METHODS. We selected 17 consecutive cases anatomopathologically diagnosed as cavernoma during 9 years. Immunohistochemical staining was performed for HIF-1alpha and MMP-9. We evaluated the relation between seizures and the scale of uptake of different tissues surrounding cavernoma. RESULTS. Cases with seizures had HIF-1alpha positive uptake in vascular endothelium in 31%, 17% in fibrous tissue and 34% in inflammatory tissue. Besides, it also shows MMP-9 positive uptake in vascular endothelium in 86%, 100% in fibrous tissue and 43% of brain tissue. Statistical analysis by chi-square and odds ratio shows a positive trend towards seizures and the presence of HIF-1alpha and MMP-9 in vascular tissue, fibrous tissue and brain tissue, but no for inflammatory tissue. CONCLUSION. HIF-1alpha and MMP-9, valued by immunohistochemical methods, are related to complications as seizures. more...
- Published
- 2012
48. Current status of chemotherapy in the treatment of advanced carcinoma of the thyroid gland.
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Poster DS, Bruno S, Penta J, Pina K, and Catane R
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- Drug Therapy, Combination, Humans, Thyroid Neoplasms radiotherapy, Thyroid Neoplasms surgery, Thyroid Neoplasms drug therapy
- Abstract
An extensive review of the literature was undertaken to identify single agents and chemotherapeutic combinations active against advanced thyroid carcinoma. The two most intensively studied agents were Adriamycin and bleomycin, both of which appear to have definite activity against advanced disease. Studies of 25 other single agents and 17 drug combinations were also reviewed but most of the studies suffered from extremely poor patient accrual, thus precluding statistical analysis. Two cooperative group protocols are in progress which will hopefully accrue enough patients for meaningful interpretation. Physicians treating advanced thyroid carcinoma patients are urged to participate in these studies. more...
- Published
- 1981
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