SIMBAD references

2007MNRAS.382.1804S - Mon. Not. R. Astron. Soc., 382, 1804-1808 (2007/December-3)

Near-infrared spectroscopy of the very low mass companion to the hot DA white dwarf PG1234+482.

STEELE P.R., BURLEIGH M.R., DOBBIE P.D. and BARSTOW M.A.

Abstract (from CDS):

We present a near-infrared spectrum of the hot (Teff~55000K) hydrogen atmosphere (DA) white dwarf PG1234+482. We confirm that a very low mass companion is responsible for the previously recognized infrared photometric excess. We compare spectra of M and L dwarfs, combined with an appropriate white dwarf model, to the data to constrain the spectral type of the secondary. We find that uncertainties in the Two-Micron All-Sky Survey HK photometry of the white dwarf prevent us from distinguishing whether the secondary is stellar or substellar, and assign a spectral type of L0±1 (M9-L1).Therefore, this is the hottest and youngest (~106yr) DA white dwarf with a possible brown dwarf companion.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): binaries: spectroscopic - stars: low-mass, brown dwarfs - white dwarfs

Simbad objects: 20

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2020.10.22-06:39:44

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