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Hans Publishers, Astronomy & Astrophysics, 3(507), p. 1613-1616

DOI: 10.1051/0004-6361/200912955

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The double degenerate LP 400-22 revisited

Journal article published in 2009 by S. Vennes, A. Kawka ORCID, T. R. Vaccaro, N. M. Silvestri
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

We re-examine the properties of the high-velocity and extremely low mass white dwarf LP 400-22 and its close companion. Based on an extended observation timeline we determined a binary period of P= 1.01016 d, somewhat longer than the previously published period, and a mass function f(M_2)= 0.180 M_solar implying a mass for the companion M_2 > 0.41 M_solar. We also re-appraised the mass and cooling age of the white dwarf using low-metallicity (Z=0.001) evolutionary models appropriate for an old halo member, M_1 = 0.19 M_solar and t_cool~1.8 Gyr, and we infer a mass of 0.85 - 1.0 M_solar for the progenitor of the white dwarf. We discuss the likely origin of this system. ; Comment: Accepted for publication in A&A