John P. Subasavage et al. 2009 The Astronomical Journal 137 4547 doi:10.1088/0004-6256/137/6/4547
THE SOLAR NEIGHBORHOOD. XXI. PARALLAX RESULTS FROM THE CTIOPI 0.9 m PROGRAM: 20 NEW MEMBERS OF THE 25 PARSEC WHITE DWARF SAMPLE
FREE ISSUEJohn P. Subasavage1,6, Wei-Chun Jao1,6, Todd J. Henry1,6, P. Bergeron2, P. Dufour3, Philip A. Ianna4,6, Edgardo Costa5,6 and René A. Méndez5,6
Show affiliationsWe present accurate trigonometric parallaxes for 20 new members of the 25 pc white dwarf (WD) sample as part of the Discovery and Evalution of Nearby Stellar Embers (DENSE) project.7 http://www.DenseProject.com Previously, there were a total of 112 WD systems with trigonometric parallaxes placing them within 25 pc and of these, 99 have trigonometric parallaxes known to better than 10%. Thus, the 20 new members presented in this work represent a 20% increase in the number of WDs accurately known to be within 25 pc. In addition, we present updated parallaxes for seven known WDs within 10 pc that have been observed as part of the Astrometric Search for Planets Encircling Nearby Stars initiative to monitor nearby southern red dwarfs and WDs for astrometric perturbations from unseen companions. Including a few WD companions and WDs beyond 25 pc, we present a total of 33 trigonometric parallaxes. We perform atmospheric modeling for WDs to determine physical parameters (i.e., T eff, log g, mass, and WD age). Finally, a new ZZ Ceti pulsating WD was identified and revised constraints are placed on two mixed H/He atmosphere cool WDs that display continuum absorption in the near-infrared.
- Keywords
astrometry; Galaxy: evolution; solar neighborhood; stars: distances; white dwarfs
- Dates
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Issue 6 (2009 June)
Received 2008 November 24, accepted for publication 2009 February 16
Published 2009 April 15
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The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the 25 Parsec White Dwarf Sample
John P. Subasavage et al. 2009 The Astronomical Journal 137 4547
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