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1. Distant White Dwarfs in the US Naval Observatory Flagstaff Station Parallax Sample

Author

Leggett, S. K., Bergeron, P., Subasavage, John P., Dahn, Conard C., Harris, Hugh C., Munn, Jeffrey A., Ables, Harold D., Canzian, Blaise J., Guetter, Harry H., Henden, Arne H., Levin, Stephen E., Luginbuhl, Christian B., Monet, Alice B., Monet, David G., Pier, Jeffrey R., Stone, Ronald C., Vrba, Frederick J., Walker, Richard L., Tilleman, Trudy M., Xu, Siyi, and Dufour, P.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

This paper presents new trigonometric parallaxes and proper motions for 214 stars. The measurements were made at the US Naval Observatory Flagstaff Station (NOFS) between 1989 and 2017, and the average uncertainty in the parallax values is 0.6 mas. We find good agreement with Gaia Data Release 2 measurements for the stars in common, although there may be a small systematic offset similar to what has been found by other investigators. The sample is matched to catalogs and the literature to create a photometric dataset which spans the ultraviolet to the mid-infrared. New mid-infrared photometry is obtained for nineteen stars from archived Spitzer mosaics. New optical spectroscopy is presented for seven systems and additional spectra were obtained from the literature. We identify a sub-sample of 179 white dwarfs (WDs) at distances of 25 - 200 pc. Their spectral energy distributions (SEDs) are analyzed using model atmospheres. The models reproduce the entire flux-calibrated SED very well and provide the atmospheric chemical composition, temperature, surface gravity, mass and cooling age of each WD. Twenty-six WDs are newly classified and twelve systems are presented as candidate unresolved binaries. We confirm one WD+red dwarf system and identify two WDs as candidate dust disk systems. Twelve old and high-velocity systems are identified as candidate thick disk or halo objects. The WDs in the sample generally have Galactic disk-like ages of < 8 Gyr and masses close to the canonical 0.6 M_Sun., Comment: Accepted for publication in The Astrophysical Journal Supplement Series. Complete versions of Tables 1, 2, 19, 20, 21, 25 and Figure 15 will be available online

Published
2018
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2. CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs

Author

Dahn, Conard C., Harris, Hugh C., Subasavage, John P., Ables, Harold D., Canzian, Blaise J., Guetter, Harry H., Harris, Fred H., Henden, Arne H., Leggett, S. K., Levine, Stephen E., Luginbuhl, Christian B., Monet, Alice B., Monet, David G., Munn, Jeffrey A., Pier, Jeffrey R., Stone, Ronald C., Vrba, Frederick J., Walker, Richard L., and Tilleman, Trudy M.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

New, updated, and/or revised CCD parallaxes determined with the Strand Astrometric Reflector at the Naval Observatory Flagstaff Station (NOFS) are presented. Included are results for 309 late-type dwarf and subdwarf stars observed over the 30+ years that the program operated. For 124 of the stars, parallax determinations from other investigators have already appeared in the literature and we compare the different results. Also included here is new or updated $VI$ photometry on the Johnson-Kron-Cousins system for all but a few of the faintest targets. Together with 2MASS $JHK_s$ near-infrared photometry, a sample of absolute magnitude versus color and color versus color diagrams are constructed. Since large proper motion was a prime criterion for targeting the stars, the majority turn out to be either M-type subdwarfs or late M-type dwarfs. The sample also includes 50 dwarf or subdwarf L-type stars, and four T dwarfs. Possible halo subdwarfs are identified in the sample based on tangential velocity, subluminosity, and spectral type. Residuals from the solutions for parallax and proper motion for several stars show evidence of astrometric perturbations., Comment: Machine-readable tables are available as supplemental material (click on "Other Formats" to access)

Published
2017
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3. Parallax and Luminosity Measurements of an L Subdwarf

Author

Burgasser, Adam J., Vrba, Frederick J., Lépine, Sébastien, Munn, Jeffrey A., Luginbuhl, Christian B., Henden, Arne A., Guetter, Harry H., and Canzian, Blaise C.

Subjects
Astrophysics
Abstract

We present the first parallax and luminosity measurements for an L subdwarf, the sdL7 2MASS J05325346+8246465. Observations conducted over three years by the USNO infrared astrometry program yield an astrometric distance of 26.7+/-1.2 pc and a proper motion of 2.6241+/-0.0018"/yr. Combined with broadband spectral and photometric measurements, we determine a luminosity of log(Lbol/Lsun) = -4.24+/-0.06 and Teff = 1730+/-90 K (the latter assuming an age of 5-10 Gyr), comparable to mid-type L field dwarfs. Comparison of the luminosity of 2MASS J05325346+8246465 to theoretical evolutionary models indicates that its mass is just below the sustained hydrogen burning limit, and is therefore a brown dwarf. Its kinematics indicate a ~110 Myr, retrograde Galactic orbit which is both eccentric (3 <~ R <~ 8.5 kpc) and extends well away from the plane (Delta_Z = +/-2 kpc), consistent with membership in the inner halo population. The relatively bright J-band magnitude of 2MASS J05325346+8246465 implies significantly reduced opacity in the 1.2 micron region, consistent with inhibited condensate formation as previously proposed. Its as yet unknown subsolar metallicity remains the primary limitation in constraining its mass; determination of both parameters would provide a powerful test of interior and evolutionary models for low-mass stars and brown dwarfs., Comment: Accepted to ApJ 10 September 2007; 13 pages, 5 figures, 3 tables, formatted in emulateapj style

Published
2007
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4. Trigonometric Parallaxes of Central Stars of Planetary Nebulae

Author

Harris, Hugh C., Dahn, Conard C., Canzian, Blaise, Guetter, Harry H., Leggett, S. K., Levine, Stephen E., Luginbuhl, Christian B., Monet, Alice K. B., Monet, David G., Pier, Jeffrey R., Stone, Ronald C., Tilleman, Trudy, Vrba, Frederick J., and Walker, Richard L.

Subjects
Astrophysics
Abstract

Trigonometric parallaxes of 16 nearby planetary nebulae are presented, including reduced errors for seven objects with previous initial results and results for six new objects. The median error in the parallax is 0.42 mas, and twelve nebulae have parallax errors less than 20 percent. The parallax for PHL932 is found here to be smaller than was measured by Hipparcos, and this peculiar object is discussed. Comparisons are made with other distance estimates. The distances determined from these parallaxes tend to be intermediate between some short distance estimates and other long estimates; they are somewhat smaller than estimated from spectra of the central stars. Proper motions and tangential velocities are presented. No astrometric perturbations from unresolved close companions are detected., Comment: 24 pages, includes 4 figures. Accepted for AJ

Published
2006
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5. The Discovery of an Embedded Cluster of High-Mass Stars Near SGR 1900+14

Author

Vrba, Frederick J., Henden, Arne A., Luginbuhl, Christian B., Guetter, Harry H., Hartmann, Dieter H., and Klose, Sylvio

Subjects
Astrophysics
Abstract

Deep I-band imaging to approximately I = 26.5 of the soft gamma-ray repeater SGR 1900+14 region has revealed a compact cluster of massive stars located only a few arcseconds from the fading radio source thought to be the location of the SGR (Frail, Kulkarni, & Bloom 1999). This cluster was previously hidden in the glare of the pair of M5 supergiant stars (whose light was removed by PSF subtraction) proposed by Vrba et al. (1996) as likely associated with the SGR 1900+14. The cluster has at least 13 members within a cluster radius of approximately 0.6 pc, based on an estimated distance of 12-15 kpc. It is remarkably similar to a cluster found associated with SGR 1806-20 (Fuchs et al. 1999). That similar clusters have now been found at or near the positions of the two best-studied SGRs suggests that young neutron stars, thought to be responsible for the SGR phenomenon, have their origins in proximate compact clusters of massive stars., Comment: 5 pages, 3 figures, accepted Astrophysical Journal Letters

Published
2000
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6. Distant White Dwarfs in the US Naval Observatory Flagstaff Station Parallax Sample

Author

Leggett, S. K., primary, Bergeron, P., additional, Subasavage, John P., additional, Dahn, Conard C., additional, Harris, Hugh C., additional, Munn, Jeffrey A., additional, Ables, Harold D., additional, Canzian, Blaise J., additional, Guetter, Harry H., additional, Henden, Arne H., additional, Levine, Stephen E., additional, Luginbuhl, Christian B., additional, Monet, Alice B., additional, Monet, David G., additional, Pier, Jeffrey R., additional, Stone, Ronald C., additional, Vrba, Frederick J., additional, Walker, Richard L., additional, Tilleman, Trudy M., additional, Xu, Siyi, additional, and Dufour, P., additional

Published
2018
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11. CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs

Author

Dahn, Conard C., primary, Harris, Hugh C., additional, Subasavage, John P., additional, Ables, Harold D., additional, Canzian, Blaise J., additional, Guetter, Harry H., additional, Harris, Fred H., additional, Henden, Arne H., additional, Leggett, S. K., additional, Levine, Stephen E., additional, Luginbuhl, Christian B., additional, Monet, Alice B., additional, Monet, David G., additional, Munn, Jeffrey A., additional, Pier, Jeffrey R., additional, Stone, Ronald C., additional, Vrba, Frederick J., additional, Walker, Richard L., additional, and Tilleman, Trudy M., additional

Published
2017
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12. PARALLAXES AND PROPER MOTIONS OF QSOs: A TEST OF ASTROMETRIC PRECISION AND ACCURACY

Author

Harris, Hugh C., primary, Dahn, Conard C., additional, Zacharias, Norbert, additional, Canzian, Blaise, additional, Guetter, Harry H., additional, Levine, Stephen E., additional, Luginbuhl, Christian B., additional, Monet, Alice K. B., additional, Monet, David G., additional, Pier, Jeffrey R., additional, Stone, Ronald C., additional, Subasavage, John P., additional, Tilleman, Trudy, additional, Walker, Richard L., additional, and Johnston, Kenneth J., additional

Published
2016
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13. The binary white dwarf LHS 3236

Author

Harris, Hugh H, Dahn, Conard C, Dupuy, Trent J, Canzian, Blaise, Guetter, Harry H, Hartkopf, William I, Leggett, S K, Levine, S E, Liu, Michael C, Luginbuhl, Christian B, Ireland, Michael, Harris, Hugh H, Dahn, Conard C, Dupuy, Trent J, Canzian, Blaise, Guetter, Harry H, Hartkopf, William I, Leggett, S K, Levine, S E, Liu, Michael C, Luginbuhl, Christian B, and Ireland, Michael

Abstract

The white dwarf LHS 3236 (WD1639+153) is shown to be a double-degenerate binary, with each component having a high mass. Astrometry at the U.S. Naval Observatory gives a parallax and distance of 30.86 ± 0.25 pc and a tangential velocity of 98 km s-1, and

Published
2013

14. THE BINARY WHITE DWARF LHS 3236

Author

Harris, Hugh C., primary, Dahn, Conard C., additional, Dupuy, Trent J., additional, Canzian, Blaise, additional, Guetter, Harry H., additional, Hartkopf, William I., additional, Ireland, Michael J., additional, Leggett, S. K., additional, Levine, Stephen E., additional, Liu, Michael C., additional, Luginbuhl, Christian B., additional, Monet, Alice K. B., additional, Stone, Ronald C., additional, Subasavage, John P., additional, Tilleman, Trudy, additional, and Walker, Richard L., additional

Published
2013
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15. Trigonometric Parallaxes of Central Stars of Planetary Nebulae

Author

NAVAL OBSERVATORY FLAGSTAFF AZ, Harris, Hugh C., Dahn, Conard C., Canzian, Blaise, Guetter, Harry H., Leggett, S. K., Levine, Stephen E., Luginbuhl, Christian B., Monet, Alice K., Monet, David G., Pier, Jeffrey R., NAVAL OBSERVATORY FLAGSTAFF AZ, Harris, Hugh C., Dahn, Conard C., Canzian, Blaise, Guetter, Harry H., Leggett, S. K., Levine, Stephen E., Luginbuhl, Christian B., Monet, Alice K., Monet, David G., and Pier, Jeffrey R.

Abstract

Trigonometric parallaxes of 16 nearby planetary nebulae are presented, including reduced errors for seven objects with previous initial results and results for six new objects. The median error in the parallax is 0.42 mas, and 12 nebulae have parallax errors of less than 20%. The parallax for PHL 932 is found here to be smaller than was measured by Hipparcos, and this peculiar object is discussed. Comparisons are made with other distance estimates. The distances determined from these parallaxes tend to be intermediate between some short distance estimates and other long estimates; they are somewhat smaller than those estimated from spectra of the central stars. Proper motions and tangential velocities are presented. No astrometric perturbations from unresolved close companions are detected., Published in The Astronomical Journal, v133 p631-638, Feb 2007.

Published
2007

16. The USNO-B Catalog

Author

NAVAL OBSERVATORY FLAGSTAFF AZ, Monet, David G, Levine, Stephen E, Canzian, Blaise, Ables, Harold D, Bird, Alan R, Dahn, Conard C, Guetter, Harry H, Harris, Hugh C, Henden, Arne A, Leggett, Sandy K, NAVAL OBSERVATORY FLAGSTAFF AZ, Monet, David G, Levine, Stephen E, Canzian, Blaise, Ables, Harold D, Bird, Alan R, Dahn, Conard C, Guetter, Harry H, Harris, Hugh C, Henden, Arne A, and Leggett, Sandy K

Abstract

USNO-B is an all-sky catalog that presents positions, proper motions, magnitudes in various optical passbands, and star/galaxy estimators for 1,042,618,261 objects derived from 3,643,201,733 separate observations. The data were obtained from scans of 7435 Schmidt plates taken for the various sky surveys during the last 50 years. USNO-B1.0 is believed to provide all-sky coverage, completeness down to V = 21,02 astrometric accuracy at J2000, 0.3 mag photometric accuracy in up to five colors, and 85% accuracy for distinguishing stars from nonstellar objects. A brief discussion of various issues is given here, but the actual data are available from the US Naval Observatory Web site and others., Published in the Astronomical Journal, v125 p984-993, Feb 2003. Prepared in cooperation with the Palomar Observatory, California Institute of Technology, Pasadena, the National Optical Astronomy Observatory, Tucson, AZ, the UK Schmidt Telescope, Anglo-Australian Observatory, NSW, Australia, and the Royal Observatory Edinburgh, Scotland, UK.

Published
2003

17. Upgrades to the Flagstaff Astrometric Scanning Transit Telescope: A Fully Automated Telescope for Astrometry

Author

NAVAL OBSERVATORY FLAGSTAFF AZ, Stone, Ronald C, Monet, David G, Monet, Alice K, Harris, Frederick H, Ables, Harold D, Dahn, Conard C, Canzian, Blaise, Guetter, Harry H, Harris, Hugh C, Henden, Arne A, Levine, Steven E, Luginbuhl, Christian B, Munn, Jeffrey A, Pier, Jeffrey R, Vrba, Frederick J, Walker, Richard L, NAVAL OBSERVATORY FLAGSTAFF AZ, Stone, Ronald C, Monet, David G, Monet, Alice K, Harris, Frederick H, Ables, Harold D, Dahn, Conard C, Canzian, Blaise, Guetter, Harry H, Harris, Hugh C, Henden, Arne A, Levine, Steven E, Luginbuhl, Christian B, Munn, Jeffrey A, Pier, Jeffrey R, Vrba, Frederick J, and Walker, Richard L

Abstract

The Flagstaff Astrometric Scanning Transit Telescope (FASTT) is a fully automated telescope that takes about 41,000 CCD frames of data a year for various research projects. All aspects of the telescope's operation have been automated (e.g., target selection, observing, reduction of data, and collation of results), and manpower needs are now under one person per year, mostly involved with routine maintenance and the dissemination of data. This paper describes the FASTT instrumental system, methods used with its automated operation, and the various FASTT research projects. Among the projects, astrometry is provided in support of various spacecraft missions, to predict occultation events, calculate dynamical masses for selective asteroids, and improve the ephemerides for thousands of asteroids, the planets Jupiter to Pluto, and 17 satellites of Jupiter through Neptune. Although most of the FASTT observing program involves the solar system, FASTT stellar astrometry was used to set up a number of astrometric calibration regions along the celestial equator, verify the Hipparcos link to the International Celestial Reference Frame, determine accurate positions for a large sample of radio stars, and investigate systematic errors in the FK5 star catalog. Furthermore, the FASTT produces accurate magnitudes that are being used to investigate the shapes of thousands of asteroids. By the end of year 2003, the FASTT will have produced over 190,000 positions of solar system objects in a program to provide a very large and homogeneous database for each object that will extend over many years and include positions accurate to +/-47 to +/-300 mas, depending on the magnitude of each observed object (3.5V17.5). Moreover, extensive efforts have been undertaken to improve the systematic accuracy of FASTT equatorial positions by applying corrections in the reductions for differential color refraction, distortions in the focal plane, correcting for a magnitude dependent positional error., Published in the Astronomical Journal, v126 p2060-2080, October 2003.

Published
2003

18. Trigonometric Parallaxes for Two Late‐Type Subdwarfs: LSR 1425+71 (sdM8.0) and the Binary LSR 1610−00 (sd?M6pec)

Author

Dahn, Conard C., primary, Harris, Hugh C., additional, Levine, Stephen E., additional, Tilleman, Trudy, additional, Monet, Alice K. B., additional, Stone, Ronald C., additional, Guetter, Harry H., additional, Canzian, Blaise, additional, Pier, Jeffrey R., additional, Hartkopf, William I., additional, Liebert, James, additional, and Cushing, Michael, additional

Published
2008
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19. Parallax and Luminosity Measurements of an L Subdwarf

Author

Burgasser, Adam J., primary, Vrba, Frederick J., additional, Lepine, Sebastien, additional, Munn, Jeffrey A., additional, Luginbuhl, Christian B., additional, Henden, Arne A., additional, Guetter, Harry H., additional, and Canzian, Blaise C., additional

Published
2008
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20. Trigonometric Parallaxes of Central Stars of Planetary Nebulae

Author

Harris, Hugh C., primary, Dahn, Conard C., additional, Canzian, Blaise, additional, Guetter, Harry H., additional, Leggett, S. K., additional, Levine, Stephen E., additional, Luginbuhl, Christian B., additional, Monet, Alice K. B., additional, Monet, David G., additional, Pier, Jeffrey R., additional, Stone, Ronald C., additional, Tilleman, Trudy, additional, Vrba, Frederick J., additional, and Walker, Richard L., additional

Published
2007
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21. Upgrades to the Flagstaff Astrometric Scanning Transit Telescope: A Fully Automated Telescope for Astrometry

Author

Stone, Ronald C., primary, Monet, David G., additional, Monet, Alice K. B., additional, Harris, Frederick H., additional, Ables, Harold D., additional, Dahn, Conard C., additional, Canzian, Blaise, additional, Guetter, Harry H., additional, Harris, Hugh C., additional, Henden, Arne A., additional, Levine, Steven E., additional, Luginbuhl, Christian B., additional, Munn, Jeffrey A., additional, Pier, Jeffrey R., additional, Vrba, Frederick J., additional, and Walker, Richard L., additional

Published
2003
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22. The USNO-B Catalog

Author

Monet, David G., primary, Levine, Stephen E., additional, Canzian, Blaise, additional, Ables, Harold D., additional, Bird, Alan R., additional, Dahn, Conard C., additional, Guetter, Harry H., additional, Harris, Hugh C., additional, Henden, Arne A., additional, Leggett, Sandy K., additional, Levison, Harold F., additional, Luginbuhl, Christian B., additional, Martini, Joan, additional, Monet, Alice K. B., additional, Munn, Jeffrey A., additional, Pier, Jeffrey R., additional, Rhodes, Albert R., additional, Riepe, Betty, additional, Sell, Stephen, additional, Stone, Ronald C., additional, Vrba, Frederick J., additional, Walker, Richard L., additional, Westerhout, Gart, additional, Brucato, Robert J., additional, Reid, I. Neill, additional, Schoening, William, additional, Hartley, M., additional, Read, M. A., additional, and Tritton, S. B., additional

Published
2003
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23. Parallaxes of Brown Dwarfs at USNO

Author

Harris, Hugh C., primary, Dahn, Conard C., additional, Vrba, Frederick J., additional, Guetter, Harry H., additional, Canzian, Blaise, additional, Henden, Arne A., additional, Levine, Stephen E., additional, Luginbuhl, Christian B., additional, Monet, Alice K. B., additional, Monet, David G., additional, Pier, Jeffery R., additional, Stone, Ronald C., additional, and Walker, Richard L., additional

Published
2003
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24. Meeting the Cool Neighbors. IV. 2MASS 1835+32, a Newly Discovered M8.5 Dwarf within 6 Parsecs of the Sun

Author

Reid, I. Neill, primary, Cruz, K. L., additional, Laurie, Stephen P., additional, Liebert, James, additional, Dahn, Conard C., additional, Harris, Hugh C., additional, Guetter, Harry H., additional, Stone, Ronald C., additional, Canzian, Blaise, additional, Luginbuhl, Christian B., additional, Levine, Stephen E., additional, Monet, Alice K. B., additional, and Monet, David G., additional

Published
2003
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25. Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs

Author

Dahn, Conard C., primary, Harris, Hugh C., additional, Vrba, Frederick J., additional, Guetter, Harry H., additional, Canzian, Blaise, additional, Henden, Arne A., additional, Levine, Stephen E., additional, Luginbuhl, Christian B., additional, Monet, Alice K. B., additional, Monet, David G., additional, Pier, Jeffrey R., additional, Stone, Ronald C., additional, Walker, Richard L., additional, Burgasser, Adam J., additional, Gizis, John E., additional, Kirkpatrick, J. Davy, additional, Liebert, James, additional, and Reid, I. Neill, additional

Published
2002
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27. Astrometry and Photometry for Brown Dwarf Candidates in the Hyades

Author

Harris, Hugh C., primary, Vrba, Frederick J., additional, Dahn, Conard C., additional, Guetter, Harry H., additional, Henden, Arne A., additional, Luginbuhl, Christian B., additional, Monet, Alice K. B., additional, Monet, David G., additional, Pier, Jeffrey R., additional, Stone, Ronald C., additional, and Walker, Richard L., additional

Published
1999
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29. Astrometry and Photometry for Two Dwarf Carbon Stars

Author

Harris, Hugh C., primary, Dahn, Conard C., additional, Walker, Richard L., additional, Luginbuhl, Christian B., additional, Monet, Alice K. B., additional, Guetter, Harry H., additional, Stone, Ronald C., additional, Vrba, Frederick J., additional, Monet, David G., additional, and Pier, Jeffrey R., additional

Published
1998
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33. A search for QSOs behind globular clusters

Author

Harris, Hugh C., primary, Guetter, Harry H., additional, Pier, Jeffrey R., additional, Ables, Harold D., additional, Monet, David G., additional, Foltz, Craig B., additional, Chaffee, Frederic H., additional, Boyle, B. J., additional, and Irwin, M. J., additional

Published
1992
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