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LP 400-22, A Very Low Mass and High-Velocity White DwarfWe 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, making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.
Document ID
20070021222
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kawka, Adela (Ceskoslovenska Akademie Ved Ondrejov, Czechoslovakia)
Vennes, Stephane (Florida Inst. of Tech. Melbourne, FL, United States)
Oswalt, Terry D. (Florida Inst. of Tech. Melbourne, FL, United States)
Smith, J. Allyn (Florida Inst. of Tech. Melbourne, FL, United States)
Silvestri, Nicole M. (Washington Univ. Seattle, WA, United States)
Date Acquired
August 23, 2013
Publication Date
June 1, 2006
Publication Information
Publication: The Astrophysical Journal
Volume: 643
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NSF AST-02-05875
CONTRACT_GRANT: NNG05GE33G
CONTRACT_GRANT: NGT-51086
CONTRACT_GRANT: NST-200415
CONTRACT_GRANT: NNG05GL42G
CONTRACT_GRANT: NSF AST-02-06115
Distribution Limits
Public
Copyright
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