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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…
Trigonometric Parallaxes of Central Stars of Planetary Nebulae
Hugh C. Harris, Conard C. Dahn, Blaise Canzian +11
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…
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…
An Initial Survey of White Dwarfs in the Sloan Digital Sky Survey
H. C. Harris, J. Liebert, S. J. Kleinman +35
An initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the fu…
Parallaxes of Brown Dwarfs at USNO
H. C. Harris, C. C. Dahn, F. J. Vrba +10
Trigonometric parallaxes have been measured by Dahn et al. (2002) for 28 cool dwarfs and brown dwarfs, including 17 L dwarfs and three T dwarfs. Broadband CCD and near-IR photometr…
Discovery of Four Field Methane (T-type) Dwarfs with 2MASS
A. J. Burgasser, J. D. Kirkpatrick, M. E. Brown +8
We report the discovery of four field methane (T-type) brown dwarfs using 2MASS survey data. One additional methane dwarf, previously discovered by SDSS, was also identified. Near-…