An X-Ray Selected White Dwarf + M Dwarf Binary: RX J0458.9-6628
Abstract
A new close binary containing a DA white dwarf and a dwarf M star has been identified from its X-ray emission. The spectra of both stars are seen with about equal flux at ~4600A. H and Ca II emission, associated with the M star, is also present. Limited photometry does not show any variability, but radial velocity changes indicate the binary period lies in the range from ~0.7 to a few days. The small observed velocity range and lack of pronounced emission line changes suggest a low inclination system. The DA velocities are poorly determined but suggest the unlikely conclusion that it may be the less massive star in the binary. (SECTION: Stars)
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- October 1995
- DOI:
- 10.1086/133641
- Bibcode:
- 1995PASP..107..931H
- Keywords:
-
- WHITE DWARFS;
- BINARIES: CLOSE;
- X-RAYS: STARS