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15 results on '"Bonatto, C"'

1. Probing Mass Segregation in NGC 6397

Author

Martinazzi, E., Pieres, A., Kepler, S. O., Costa, J. E. S., Bonatto, C., and Bica, E.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Solar and Stellar Astrophysics, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

In this study, we present a detailed study of mass segregation in the globular clister NGC 6397. First, we carry out a photometric analysis of projected ESO-VLT data (between 1 and 10 arcmin from the cluster centre), presenting the luminosity function corrected by completeness. The luminosity function shows a higher density of bright stars near the central region of the data, with respect to the outer region. We calculate a deprojected model (covering the whole cluster) estimating a total number of stars of 193000 +- 19000. The shapes of the surface brightness and density-number profiles versus the radial coordinate r (instead of the projected coordinate R) lead to a decreasing luminosity for an average star, and thus of mass, up to 1 arcmin, quantifying the mass segregation. The deprojected model does not show evidence of mass segregation outside this region.

Published
2014
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2. Panchromatic fits to the Globular Cluster NGC 6366

Author

Campos, Fabíola, Kepler, S. O., and Bonatto, C.

Subjects
Astrophysics - Solar and Stellar Astrophysics, FOS: Physical sciences, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

We present panchromatic isochrone fits to the color magnitude data of the globular cluster NGC 6366, based on HST ACS/WFC and SOAR photometric data. Before performing the isochrone fits, we corrected the photometric data for differential reddening and calculated the mean ridge line of the color magnitude diagrams. We compared the isochrones of Dartmouth Stellar Evolution Database and PAdova and TRieste Stellar Evolution Code (with microscopic diffusion starting on the main sequence). Based on previous determinations of the metallicity of this cluster we test it from [Fe/H]=-1.00 to [Fe/H]= -0.50, and the age from 9 to 13 Gyrs. The uncertainties do not decrease when we fit simultaneous colors. We also find that the Dartmouth Stellar Evolution Database isochrones have a better fit in the sub giant branch and low main sequence than the PAdova and TRieste Stellar Evolution Code. Considering the most recent spectroscopic determination of the metallicity ([Fe/H]= -0.67), we find E(B-V)=0.69+/-0.02, (m-M)_V=15.02+/-0.07 and 11+/-2 Gyr for NGC 6366., Comment: 4 pages, 2 figures. Proceedings of the conference "Reading the book of globular clusters with the lens of stellar evolution", to be published in Memorie della Societ\'a Astronomica Italiana

Published
2013
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3. Anchors for the Cosmic Distance Scale: the Cepheids U Sgr, CF Cas and CEab Cas

Author

Majaess, D., Carraro, G., Bidin, C. Moni, Bonatto, C., Berdnikov, L., Balam, D., Moyano, M., Gallo, L., Turner, D., Lane, D., Gieren, W., Borissova, J., Kovtyukh, V., and Beletsky, Y.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics - Astrophysics of Galaxies, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

New and existing X-ray, UBVJHKsW(1-4), and spectroscopic observations were analyzed to constrain fundamental parameters for M25, NGC 7790, and dust along their sight-lines. The star clusters are of particular importance given they host the classical Cepheids U Sgr, CF Cas, and the visual binary Cepheids CEa and CEb Cas. Precise results from the multiband analysis, in tandem with a comprehensive determination of the Cepheids' period evolution (dP/dt) from ~140 years of observations, helped resolve concerns raised regarding the clusters and their key Cepheid constituents. Specifically, distances derived for members of M25 and NGC 7790 are 630+-25 pc and 3.40+-0.15 kpc, respectively., Comment: To appear in Astronomy and Astrophysics

Published
2013
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4. The Vista Variables in the Via Lactea (VVV) ESO Public Survey: Current Status and First Results

Author

Catelan, M., Minniti, D., Lucas, P. W., Alonso-García, J., Angeloni, R., Beamín, J. C., Bonatto, C., Borissova, J., Contreras, C., Cross, N., Dékáany, I., Emerson, J. P., Eyheramendy, S., Geisler, D., González-Solares, E., Helminiak, K. G., Hempel, M., Irwin, M. J., Ivanov, V. D., Jordán, A., Kerins, E., Kurtev, R., Mauro, F., Moni Bidin, C., Navarrete, C., Pérez, P., Pichara, K., Read, M., Marina Rejkuba, Saito, R. K., Sale, S. E., and Toledo, I.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Astrophysics of Galaxies, Instrumentation and Methods for Astrophysics (astro-ph.IM), Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

Vista Variables in the Via Lactea (VVV) is an ESO Public Survey that is performing a variability survey of the Galactic bulge and part of the inner disk using ESO's Visible and Infrared Survey Telescope for Astronomy (VISTA). The survey covers 520 deg^2 of sky area in the ZYJHK_S filters, for a total observing time of 1929 hours, including ~ 10^9 point sources and an estimated ~ 10^6 variable stars. Here we describe the current status of the VVV Survey, in addition to a variety of new results based on VVV data, including light curves for variable stars, newly discovered globular clusters, open clusters, and associations. A set of reddening-free indices based on the ZYJHK_S system is also introduced. Finally, we provide an overview of the VVV Templates Project, whose main goal is to derive well-defined light curve templates in the near-IR, for the automated classification of VVV light curves., Comment: 25 pages, 18 figures. To appear in the Carnegie Observatories Astrophysics Series, Volume 5

Published
2011
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5. Near-infrared integrated spectra of Galactic globular clusters: testing simple stellar population models

Author

Riffel, R., Ruschel-Dutra, D., Pastoriza, M. G., Rodriguez-Ardila, A., Santos Jr., J. F. C., Bonatto, C. J., and Ducati, J. R.

Subjects
Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics - Astrophysics of Galaxies
Abstract

We present SOAR/OSIRIS cross-dispersed NIR integrated spectra of 12 Galactic globular clusters that are employed to test Maraston (2005, M05) NIR EPS models, and to provide spectral observational constraints to calibrate future models. We measured Ew of the most prominent NIR absorption features. Optical Ew were also measured. The globular clusters Ew were compared with model predictions with ages within 4-15 Gyr, and metallicities between 1/200 and 2 Zsun. Observed integrated colours were also compared with models. The NIR integrated spectra among our sample appear qualitatively similar in most the absorption features. The M05 models can properly predict the optical Ew observed in globular clusters. Regarding the NIR, they do underestimate the strength of Mg I 1.49mum, but they can reproduce the observed Ew of Fe I 1.58mum, Si I 1.59mum, and CO 2.29mum, in about half of our sample. The remaining objects require the inclusion of intermediate-age populations. Thus, we suggest that the presence of C- and O-rich stars in models is important to reproduce the observed strengths of metallic lines. Another possibility is the lack of alpha-enhancement in the models. In the case of the optical and NIR Fe I lines, standard models and those that include blue horizontal branch stars, produce similar results. A similar trend is observed for Na I 5895A, while in the case of the G-band, the models with blue horizontal branch do describe better the observations. For most of the sample the optical to NIR colours are well described by the M05 models. In general, M05 models can provide reliable information on the NIR stellar population of galaxies, but only when Ew and colours are taken together, in other words, Ew and continuum fluxes should be simultaneously fitted. However, the results should be taken with caution, since the models tend to predict results biased towards young ages., Comment: 11 pages, 10 Figures, Accepted by MNRAS

Published
2010
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6. The VVV Survey of the Milky Way: first year results

Author

Minniti, D., Clariá, J. J., Saito, R. K., Hempel, M., Lucas, P. W., Rejkuba, M., Toledo, I., Gonzalez, O. A., Alonso-García, J., Irwin, M. J., Gonzalez-Solares, E., Nicholas Cross, Ivanov, V. D., Soto, M., Dékány, I., Angeloni, R., Catelan, M., Amôres, E. B., Gurovich, S., Emerson, J. P., Lewis, J., Hodgkin, S., Pietrukowicz, P., Zoccali, M., Sale, S. E., Barbá, R., Barbuy, B., Beamin, J. C., Helminiak, K., Borissova, J., Folkes, S. L., Gamen, R. C., Geisler, D., Mauro, F., Chené, A. -N, Alonso, M. V., Gunthardt, G., Hanson, M., Kerins, E., Kurtev, R., Majaess, D., Martín, E., Masetti, N., Mirabel, I. F., Monaco, L., Moni Bidin, C., Padilla, N., Rojas, A., Pietrzynski, G., Saviane, I., Valenti, E., Weidmann, W., López-Corredoira, M., Ahumada, A. V., Aigrain, S., Arias, J. I., Bica, E., Bandyopadhyay, R. M., Baume, G., Bedin, L. R., Bonatto, C., Bronfman, L., Carraro, G., Contreras, C., Davis, C. J., Grijs, R., Dias, B., Drew, J. E., Fariña, C., Feinstein, C., Fernández Lajús, E., Gieren, W., Goldman, B., Gosling, A., Hambly, N. C., Hoare, M., Jordán, A., Kinemuchi, K., Maccarone, T., Merlo, D. C., Mennickent, R. E., Morelli, L., Motta, V., Palma, T., Popescu, B., Parisi, M. C., Parker, Q., Pignata, G., Read, M. A., Ruiz, M. T., Roman-Lopes, A., Schreiber, M. R., Schröder, A. C., Smith, M., Sodré, L., Stephens, A. W., Walton, N. A., Zijlstra, A. A., Tamura, M., Tappert, C., Thompson, M. A., and Vanzi, L.

7. Introduction on bioethanol

Author

Bonatto, C., Venturin, B., Mayer, D. A., Bazoti, S. F., Mulinari, J., Camargo, A. F., Scapini, T., Müller, C., Fongaro, G., and Helen Treichel

8. Bioethanol from fruit residues

Author

Scapini, T., Cadore Favaretto, D. P., Camargo, A. F., Czapela, F. F., Bonatto, C., Zanivan, J., Dalastra, C., Klanovicz, N., Souza, T., Müller, C., Fongaro, G., and Helen Treichel

9. The VVV Survey: New Results (Part II)

Author

Minniti, D., Saito, R. K., Hempel, M., Lucas, P. W., Rejkuba, M., Toledo, I., Gonzalez, O. A., Alonso-García, J., Irwin, M. J., Gonzalez-Solares, E., Hodgkin, S. T., Lewis, J. R., Nicholas Cross, Ivanov, V. D., Kerins, E., Emerson, J. P., Soto, M., Amôres, E. B., Gurovich, S., Dékány, I., Angeloni, R., Beamin, J. C., Catelan, M., Padilla, N., Zoccali, M., Pietrukowicz, P., Moni Bidin, C., Mauro, F., Geisler, D., Folkes, S. L., Sale, S. E., Borissova, J., Kurtev, R., Ahumada, A. V., Alonso, M. V., Adamson, A., Arias, J. I., Bandyopadhyay, R. M., Barbá, R. H., Barbuy, B., Baume, G. L., Bedin, L. R., Benjamin, R., Bica, E., Bonatto, C., Bronfman, L., Carraro, G., Chenè, A. N., Clariá, J. J., Clarke, J. R. A., Contreras, C., Corvillón, A., Grijs, R., Dias, B., Drew, J. E., Fariña, C., Feinstein, C., Fernández-Lajús, E., Gamen, R. C., Gieren, W., Goldman, B., González-Fernández, C., Grand, R. J. J., Gunthardt, G., Hambly, N. C., Hanson, M. M., Helminiak, K., Hoare, M. G., Huckvale, L., Jordán, A., Kinemuchi, K., Longmore, A., López-Corredoira, M., Maccarone, T., Majaess, D., Martín, E., Masetti, N., Mennickent, R. E., Mirabel, I. F., Monaco, L., Morelli, L., Motta, V., Palma, T., Parisi, M. C., Parker, Q., Peñaloza, F., Pietrzyński, G., Pignata, G., Popescu, B., Read, M. A., Rojas, A., Roman-Lopes, A., Ruiz, M. T., Saviane, I., Schreiber, M. R., Schröder, A. C., Sharma, S., Smith, M. D., Sodré, L., Stead, J., Stephens, A. W., Tamura, M., Tappert, C., Thompson, M. A., Valenti, E., Vanzi, L., Walton, N. A., Weidmann, W., and Zijlstra, A.

12. Strip Photometry of Comet Halley

Author

Ducati, J. R., Bergmann, T. S., Bevilacqua, C. M., Bonatto, C., Cavalcanti, R. L., Costa, R. D. D., Dottori, H. A., Girardi, L., Hadjimichef, D., Kepler, S. O., Livi, S. H. B., Pastoriza, M. G., Santos, J. F., Alex A. Schmidt, and Schroder, M. F. S.

13. Reducing the water footprint of bioethanol

Author

Camargo, A. F., Scapini, T., Stefanski, F. S., Kubeneck, S., Preczeski, K. P., Venturin, B., Bonatto, C., Bordin, E. R., Müller, C., Fongaro, G., and Helen Treichel

14. J-PLUS: The Javalambre Photometric Local Universe Survey

Author

Cenarro, A. J., Moles, M., Cristóbal-Hornillos, D., Marín-Franch, A., Ederoclite, A., Varela, J., López-Sanjuan, C., Hernández-Monteagudo, C., Angulo, R. E., Ramió, H. Vázquez, Viironen, K., Bonoli, S., Orsi, A. A., Hurier, G., San Roman, I., Greisel, N., Vilella-Rojo, G., Díaz-García, L. A., Logroño-García, R., Gurung-López, S., Daniele Spinoso, Izquierdo-Villalba, D., Aguerri, J. A. L., Allende Prieto, C., Bonatto, C., Carvano, J. M., Chies-Santos, A. L., Daflon, S., Dupke, R. A., Falcón-Barroso, J., Gonçalves, D. R., Jiménez-Teja, Y., Molino, A., Placco, V. M., Solano, E., Whitten, D. D., Abril, J., Antón, J. L., Bello, R., Toledo, S. Bielsa, Castillo-Ramírez, J., Chueca, S., Civera, T., Díaz-Martín, M. C., Domínguez-Martínez, M., Garzarán-Calderaro, J., Hernández-Fuertes, J., Iglesias-Marzoa, R., Iñiguez, C., and Ruiz, J. M. Jiménez

15. The VVV Survey: New Results (Part I)

Author

Minniti, D., Saito, R. K., Hempel, M., Lucas, P. W., Rejkuba, M., Toledo, I., Gonzalez, O. A., Alonso-García, J., Irwin, M. J., Gonzalez-Solares, E., Hodgkin, S. T., Lewis, J. R., Cross, N., Ivanov, V. D., Kerins, E., Emerson, J. P., Soto, M., Amôres, E. B., Gurovich, S., Dékány, I., Angeloni, R., Beamin, J. C., Catelan, M., Padilla, N., Zoccali, M., Pietrukowicz, P., Moni Bidin, C., Mauro, F., Geisler, D., Folkes, S. L., Sale, S. E., Borissova, J., Kurtev, R., Ahumada, A. V., Alonso, M. V., Adamson, A., Arias, J. I., Bandyopadhyay, R. M., Barbá, R. H., Barbuy, B., Baume, G. L., Bedin, L. R., Benjamin, R., Bica, E., Bonatto, C., Bronfman, L., Carraro, G., Chenè, A. N., Clariá, J. J., Clarke, J. R. A., Contreras, C., Corvillón, A., Grijs, R., Dias, B., Drew, J. E., Fariía, C., Feinstein, C., Fernández-Lajús, E., Gamen, R. C., Gieren, W., Goldman, B., González-Fernández, C., Grand, R. J. J., Gunthardt, G., Hambly, N. C., Hanson, M. M., Helminiak, K., Hoare, M. G., Huckvale, L., Jordán, A., Kinemuchi, K., Longmore, A., López-Corredoira, M., Maccarone, T., Majaess, D., Martín, E., Masetti, N., Mennickent, R. E., Mirabel, I. F., Monaco, L., Morelli, L., Motta, V., Palma, T., Parisi, M. C., Parker, Q., Peñaloza, F., Pietrzyński, G., Pignata, G., Popescu, B., Read, M. A., Rojas, A., Roman-Lopes, A., Ruiz, M. T., Saviane, I., Schreiber, M. R., Schröder, A. C., Sharma, S., Smith, M. D., Sodré, L., Stead, J., Stephens, A. W., Tamura, M., Tappert, C., Thompson, M. A., Elena Valenti, Vanzi, L., Walton, N. A., Weidmann, W., and Zijlstra, A.

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