Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..711b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 3, pp. 711-721.
Astronomy and Astrophysics
Astronomy
16
Stars: Atmospheres, Binaries: Close, Stars: Individual: Re 0720-318, White Dwarfs, Ultraviolet: Stars, X-Rays: Stars
Scientific paper
A number of pre-cataclysmic binaries, comprising a hot white dwarf with a red dwarf companion, have been discovered as a result of the optical identification of EUV sources from the ROSAT all-sky survey. From the detection of narrow emission lines in recently recorded optical spectra, we report here the discovery that RE 0720-318 (listed just as a DA white dwarf in the Wide Field Camera Bright Source Catalogue) is a further example of such a system. A HeII 4686-A absorption feature indicates that the white dwarf is a hydrogen-helium hybrid DAO star. This is only the third DAO to be detected as an EUV/X-ray source, and it is remarkable that all three reside in pre-cataclysmic binaries. From follow-up optical photometry coupled with emission-line radial velocity and intensity measurements from the spectral data, we obtain an orbital period of 1.201d.
Barstow Martin Adrian
Burleigh Matthew R.
Fleming Thomas Anthony
Kilkenny Dave
O'Donoghue Darragh
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