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Title:
LP 400-22, a Very Low Mass and High-Velocity White Dwarf
Authors:
Kawka, Adela; Vennes, Stéphane; Oswalt, Terry D.; Smith, J. Allyn; Silvestri, Nicole M.
Affiliation:
AA(Astronomický ústav, AV ČR, Fričova 298, 25165 Ondřejov, Czech Republic; ), AB(Department of Physics and Space Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901-6975 , , ), AC(Department of Physics and Space Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901-6975 , , ), AD(Department of Physics and Space Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901-6975 , , ), AE(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195; )
Publication:
The Astrophysical Journal, Volume 643, Issue 2, pp. L123-L126. (ApJL Homepage)
Publication Date:
06/2006
Origin:
UCP
ApJ Keywords:
Stars: Atmospheres, stars: individual (LP 400-22), Stars: White Dwarfs
DOI:
10.1086/505143
Bibliographic Code:
2006ApJ...643L.123K

Abstract

We report the identification of LP 400-22 (WD 2234+222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080 +/- 140 K and a surface gravity of logg=6.32+/-0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 Msolar. The tangential velocity of this white dwarf is 414+/-43 km s-1, making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.
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