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Title:
An X-Ray Selected White Dwarf + M Dwarf Binary: RX J0458.9-6628
Authors:
Hutchings, J. B.; Crampton, D.; Cowley, A. P.; Schmidtke, P. C.; McGrath, T. K.; Chu, Y.-H.
Publication:
Publications of the Astronomical Society of the Pacific, v.107, p.931 (PASP Homepage)
Publication Date:
10/1995
Origin:
PASP; KNUDSEN
PASP/ApJ Keywords:
WHITE DWARFS, BINARIES: CLOSE, X-RAYS: STARS
DOI:
10.1086/133641
Bibliographic Code:
1995PASP..107..931H

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)

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