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Issue A&A
Volume 439, Number 3, September I 2005
Page(s) 1159 - 1163
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20053215



A&A 439, 1159-1163 (2005)
DOI: 10.1051/0004-6361:20053215

Research Note

A near-IR spectrum of the DO white dwarf RE J0503-285

P. D. Dobbie1, M. R. Burleigh1, A. J. Levan1, M. A. Barstow1, R. Napiwotzki1 and I. Hubeny2

1  Dept. of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK
    e-mail: [pdd;mbu;anl;mab]@star.le.ac.uk
2  Dept. of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
    e-mail: hubeny@as.arizona.edu

(Received 8 April 2005 / Accepted 13 June 2005)

Abstract
We present a near-IR spectroscopic analysis of the intriguing DO white dwarf RE J0503-285. The IR spectrum fails to reveal evidence of the presence of a spatially unresolved, cool, late-type companion. Hence we have placed an approximate limit on the spectral-type and mass of a putative companion (later than M8, $M<0.085~M_{\odot}$). This result rules out ongoing interaction between the white dwarf and a close companion with $M\ge0.085~M_{\odot}$ as responsible for the discrepancies between the observed photospheric abundances and model predictions. As the possibility remains that there is a cooler companion lying beyond the detection threshold of this study we use our modelling to estimate the improvement in sensitivity offered by a Spitzer observation.


Key words: stars: white dwarfs -- stars: atmospheres -- stars: binaries: spectroscopic -- stars: individual: RE J0503-285

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© ESO 2005


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