A near-IR spectrum of the DO white dwarf RE J0503-285
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: email@example.com
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