Observations of Ultracool White Dwarfs | Zendy

Rebecca Oppenheimer | Zendy; D. Saumon | Zendy; S. T. Hodgkin | Zendy; R. F. Jameson | Zendy; N. C. Hambly | Zendy; G. Chabrier | Zendy; A. V. Filippenko | Zendy; Alison L. Coil | Zendy; Michael E. Brown | Zendy

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Observations of Ultracool White Dwarfs

Author(s) -

Rebecca Oppenheimer,

D. Saumon,

S. T. Hodgkin,

R. F. Jameson,

N. C. Hambly,

G. Chabrier,

A. V. Filippenko,

Alison L. Coil,

Michael E. Brown

Publication year - 2001

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 - 10.1086/319718

Subject(s) - white dwarf , halo , astrophysics , population , degenerate energy levels , galactic halo , physics , helium , radiative transfer , atmosphere (unit) , astronomy , stars , meteorology , optics , atomic physics , demography , quantum mechanics , galaxy , sociology

We present new spectroscopic and photometric measurements of the white dwarfsLHS 3250 and WD 0346+246. Along with F351-50, these white dwarfs are thecoolest ones known, all with effective temperatures below 4000 K. Theirmembership in the Galactic halo population is discussed, and detailedcomparisons of all three objects with new atmosphere models are presented. Thenew models consider the effects of mixed H/He atmospheres and indicate that WD0346+246 and F351-50 have predominantly helium atmospheres with only traces ofhydrogen. LHS 3250 may be a double degenerate whose average radiativetemperature is between 2000 and 4000 K, but the new models fail to explain thisobject.Comment: Accepted to Astronomical Journal, March 200

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