LP 400-22, A very low-mass and high-velocity white dwarf

Details LP 400-22, A very low-mass and high-velocity white dwarf LP 400-22, A very low-mass and high-velocity white dwarf

2006-04-21

arxiv.org/abs/astro-ph/0604470v3

Astrophys.J. 643 (2006) L123-L126

Astronomy and Astrophysics

Astrophysics

accepted for publication in ApJ Letters, made minor corrections

Scientific paper

10.1086/505143

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.

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