Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112..258c&link_type=abstract
Astronomical Journal v.112, p.258
Astronomy and Astrophysics
Astronomy
8
White Dwarfs, X-Rays: Stars, Ultraviolet: Stars
Scientific paper
We present x-ray, ultraviolet, and optical observations of the mysterious EUV/soft x-ray source EUVE J0356-336 (= MS0354.6-3650). Initial Einstein observations identified this source with a cluster of galaxies, but the relatively high source count rate in the Extreme Ultraviolet Explorer (EUVE) 100 Å band and the lack of variability hinted that EUVE J0356-3650 might be a white dwarf; the UK Schmidt plate of the field surrounding this object found a 12.45 magnitude G2V star that could hide a compact companion. This hypothesis was confirmed in an IUE ultraviolet spectrum that shows the definite signature of a hydrogen-rich white dwarf (DA). A model atmosphere analysis shows that the DA star is hot (Teff≥52,000 K) and may have a low abundance of heavy elements. We show that the G2V star and the DA star form a physical pair at a distance of 400 pc and therefore add to the list of white dwarf plus luminous main sequence star binaries discovered in EUV surveys.
Christian Damian Joseph
Mathioudakis Mihalis
Thorstensen John R.
Vennes Stephane
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