Discovery of a Cool, Massive, and Metal-rich DAZ White Dwarf | Zendy

A. Gianninas | Zendy; P. Dufour | Zendy; P. Bergeron | Zendy

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Discovery of a Cool, Massive, and Metal-rich DAZ White Dwarf

Author(s) -

A. Gianninas,

P. Dufour,

P. Bergeron

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/427080

Subject(s) - white dwarf , surface gravity , astrophysics , physics , effective temperature , atmosphere (unit) , metal , spectral line , accretion (finance) , star (game theory) , stars , astronomy , chemistry , thermodynamics , organic chemistry

We report the discovery of a new metal-rich DAZ white dwarf, GD 362. Highsignal-to-noise optical spectroscopy reveals the presence of spectral linesfrom hydrogen as well as CaI, CaII, MgI, and FeI. A detailed model atmosphereanalysis of this star yields an effective temperature of Teff = 9740 +/- 50 K,a surface gravity of log g = 9.12 +/- 0.07, and photospheric abundances of logCa/H = -5.2 +/- 0.1, log Mg/H = -4.8 +/- 0.1, and log Fe/H = -4.5 +/- 0.1.White dwarf cooling models are used to derive a mass of 1.24 Mo for GD 362,making it the most massive and metal-rich DAZ uncovered to date. The problemsrelated to the presence of such large metal abundances in a nearby (d ~ 25 pc)white dwarf in terms of an accretion scenario are briefly discussed.Comment: 11 pages, 3 figures, accepted for publication in the ApJ Letter

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