The Solar Neighborhood XXIV. Parallax Results from the CTIOPI 0.9-m Program: Stars with $\mu$ $\ge$ 1\farcs0 yr${}^{-1}$ (MOTION Sample) and Subdwarfs

Abstract

We present 41 trigonometric parallaxes of 37 stellar systems, most of which have proper motions greater than 1\farcs0 yr${}^{-1}$. These are the first trigonometric parallaxes for 24 systems. Overall, there are 15 red dwarf systems and 22 red subdwarf systems in the sample. Five of the systems are multiples with directly detected companions, and we have discovered perturbations caused by unseen companions in two additional cases, the dwarf LHS 501 and the subdwarf LHS 440. The latter system may eventually provide important dynamical mass points on the subdwarf mass-luminosity relation. Two additional stars of note are LHS 272, the third closest M-type subdwarf at a distance of only 13.6 pc, and LHS 2734AB, a high velocity subdwarf binary with $V_{tan}>$ 700 km/sec, which likely exceeds the escape velocity of the Milky Way. We also report the first long term variability study of cool subdwarfs indicating that cool subdwarfs are less photometrically variable than their main sequence counterparts.

28 pages, 7 figures, 3 tables, accepted by AJ

References in corpus (7)

• The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
• The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9m Program: 20 New Members of the 25 Parsec White Dwarf Sample
• Cool Subdwarf Investigations (CSI) I: New Thoughts for the Spectral Types of K and M Subdwarfs
• The Solar Neighborhood. XXII. Parallax Results from the CTIOPI 0.9m Program: Trigonometric Parallaxes of 64 Nearby Systems with 0\farcs5 $\le \mu \le$ 1\farcs0 yr${}^{-1}$ (SLOWMO sample)
• The Trigonometric Parallax of the Brown Dwarf Planetary System 2MASSW J1207334-393254
• The Solar Neighborhood XXIII CCD Photometric Distance Estimates of SCR Targets -- 77 M Dwarf Systems within 25 Parsecs
• Cool Subdwarf Investigations II: Multiplicity

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