A&A 439, 1159-1163 (2005)
A near-IR spectrum of the DO white dwarf RE J0503-285P. 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
2 Dept. of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
(Received 8 April 2005 / Accepted 13 June 2005)
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, ). This result rules out ongoing interaction between the white dwarf and a close companion with 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
© ESO 2005