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7 papers
Trigonometric Parallaxes for Two Late-Type Subdwarfs: LSR1425+71 (sdM8.0) and the Binary LSR1610-00 (sd?M6pec)
C. C. Dahn, H. C. Harris, S. E. Levine +9
Trigonometric parallax astrometry and BVI photometry are presented for two late-type subdwarf candidates, LSR1425+71 (sdM8.0) and LSR1610-00 (sd?M6pec). For the former we measure a…
Parallax and Luminosity Measurements of an L Subdwarf
Adam J. Burgasser, Frederick J. Vrba, Sébastien Lépine +5
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 astromet…
Near-Infrared Photometry and Spectroscopy of L and T Dwarfs: the Effects of Temperature, Clouds, and Gravity
G. R. Knapp, S. K. Leggett, X. Fan +3
We present JHK photometry and spectroscopy for a sample of newly identified L and T dwarfs from the Sloan Digital Sky Survey (SDSS) and known dwarfs from the SDSS and the Two Micro…
Analysis of a Very Massive DA White Dwarf via the Trigonometric Parallax and Spectroscopic Methods
C. C. Dahn, P. Bergeron, J. Liebert +2
By two different methods, we show that LHS 4033 is an extremely massive white dwarf near its likely upper mass limit for destruction by unstable electron captures. From the accurat…
The USNO-B Catalog
D. Monet, S. Levine, B. Canzian +26
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 3,6…
Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
C. C. Dahn, H. C. Harris, F. J. Vrba +15
Trigonometric parallax determinations are presented for 28 late type dwarfs and brown dwarfs, including eight M dwarfs with spectral types between M7 and M9.5, 17 L dwarfs with spe…