2006/04/30 by Adela Kawka, Stephane Vennes, Stéphane Vennes +3 · 1 citation
Physics and Astronomy · Social Sciences · #Astronomy and Astrophysical Research #Educational Leadership and Practices #Effective temperature #Line (geometry) #Low Mass #Spectral line #Stellar classification #Stellar, planetary, and galactic studies #Surface gravity #Ultraviolet #White dwarf #astro-ph
paper · pdf · doi:10.1086/505143
published as Astrophys.J. 643 (2006) L123-L126 · accepted for publication in ApJ Letters, made minor corrections
arxiv created 2006/05/05 · openalex publication_date 2006/05/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 = 6.32 ± 0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M ☉ . 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.