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 log g p 6.32 ± 0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 MꙨ. 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.
The Astrophysical Journal
Grant or Award Name
NSF AST 0206115, GSRP Training Grant NGT-51086
Scholarly Commons Citation
Kawka, A., Vennes, S., Oswalt, T. D., Smith, J., & Silvestri, N. M. (2006). LP 400-22, A Very Low Mass and High-Velocity White Dwarf. The Astrophysical Journal, 643(2). https://doi.org/10.1086/505143