RE 1016-053 - A pre-cataclysmic binary, and the first extreme ultraviolet and X-ray detections of a DAO white dwarf

Details RE 1016-053 - A pre-cataclysmic binary, and the first extreme ultraviolet and X-ray detections of a DAO white dwarf RE 1016-053 - A pre-cataclysmic binary, and the first extreme ultraviolet and X-ray detections of a DAO white dwarf

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1938t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 5, p. 1938-1944.

Astronomy and Astrophysics

Astronomy

37

Astronomical Photometry, Balmer Series, Emission Spectra, Extreme Ultraviolet Radiation, Ultraviolet Spectroscopy, White Dwarf Stars, X Ray Sources, Asymptotic Giant Branch Stars, Calcium, Helium, Hydrogen, Stellar Mass Ejection

Scientific paper

Photometric observations and analysis of the optical, UV, EUV, and X-ray spectra are presented for the EUV/X-ray source RE 1016-53. Multiwavelength observations of RE 1016-53 point out that it is a precataclysmic binary. Optical spectra exhibit the steep blue continuum and Balmer absorption typical of a hot white dwarf, but there are bright, narrow emission lines of H I, He I, and Ca II superimposed on this. The white dwarf component, with T (eff) = 55,800 +/- 1000 K and log g = 7.81 +/- 0.007, dominates the spectrum from the optical to the EUV/X-ray. An He II 4686 A absorption line suggests that the white dwarf is a hydrogen-helium (DAO) hybrid star. Four of the five precataclysmic binaries with white dwarfs with T(eff) greater than 40,000 K appear to be DAOs. A mass of 0.57 +/- 0.003 solar mass has been derived.

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