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Cool Subdwarf Investigations (CSI) I: New Thoughts for the Spectral Types of K and M Subdwarfs
Wei-Chun Jao, Todd J. Henry, Thomas D. Beaulieu +1
Using new spectra of 88 K and M-type subdwarfs, we consider novel methods for assigning their spectral types and take steps toward developing a comprehensive spectral sequence for…
The Solar Neighborhood. XX. Discovery and Characterization of 21 New Nearby White Dwarf Systems
John P. Subasavage, Todd J. Henry, P. Bergeron +2
We present medium resolution spectroscopy and multi-epoch VRI photometry for 21 new nearby (< 50 pc) white dwarf systems brighter than V ~ 17. Of the new systems, ten are DA (inclu…
The Trigonometric Parallax of the Brown Dwarf Planetary System 2MASSW J1207334-393254
John E. Gizis, Wei-Chun Jao, John P. Subasavage +1
We have measured a trigonometric parallax to the young brown dwarf 2MASSW J1207334-393254. The distance [54.0 (+3.2,-2.8) pc] and space motion confirm membership in the TW Hydrae A…
The Solar Neighborhood. XVIII. Discovery of new proper motion stars with 0.40 arcsec yr^-1 > mu >= 0.18 arcsec yr^-1 between declinations -90 degrees and -47 degrees
Charlie T. Finch, Todd J. Henry, John P. Subasavage +2
We report 1606 new proper motion systems in the southern sky (declinations -90 degrees to -47 degrees with 0.40 arcsec yr^-1 > mu >= 0.18 yr^-1. This effort is a continuation of th…
Identifying and Characterizing New Nearby White Dwarfs
John P. Subasavage, Todd J. Henry, Pierre Bergeron +3
How confident are we that all of the nearest white dwarfs (WDs) have been identified? In an effort to answer this question, we have begun an initiative to identify and characterize…
Joint H-alpha and X-ray Observations of Massive X-ray Binaries. I. The B-Supergiant System LS I +65 010 = 2S 0114+650
E. D. Grundstrom, J. L. Blair, D. R. Gies +8
We report on a three year spectroscopic monitoring program of the H-alpha emission in the massive X-ray binary LS I +65 010 = 2S 0114+650, which consists of a B-supergiant and a sl…