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American Astronomical Society, Astrophysical Journal, 2(643), p. L123-L126, 2006

DOI: 10.1086/505143

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LP 400-22, a Very Low Mass and High-Velocity White Dwarf

Journal article published in 2006 by Adela Kawka ORCID, Stephane Vennes, Terry D. Oswalt, J. Allyn Smith, J. Allyn Smith, Nicole M. Silvestri
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 11080+/-140 K and a surface gravity of log g = 6.32+/-0.08. Therefore, this is a helium core white dwarf with a mass of 0.17 M_solar. The tangential velocity of this white dwarf is 414+/-43 km/s, making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object. Comment: accepted for publication in ApJ Letters, made minor corrections