ROSAT/IUE discovery of a white dwarf companion to HD 33959C (F4V)

Details ROSAT/IUE discovery of a white dwarf companion to HD 33959C (F4V) ROSAT/IUE discovery of a white dwarf companion to HD 33959C (F4V)

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..229h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 263, no. 1, p. 229-235.

Astronomy and Astrophysics

Astronomy

17

Companion Stars, Sky Surveys (Astronomy), Stellar Spectra, White Dwarf Stars, Stellar Luminosity, Stellar Models, X Ray Astronomy

Scientific paper

We report the discovery, from the ROSAT EUV and X-ray all-sky surveys, and from IUE spectra, of a white dwarf (WD) companion to HD 33959C. RE 0515 + 324 is among the 10 brightest EUV sources in the sky in the 100-200 A band. It is also a strong soft X-ray source. IUE observations of candidate objects have revealed a previously uncataloged hot DA WD, visually unresolved from HD 33959C, making the pair one of three or four suggested Sirius-like systems. The estimated EUV luminosity is of the order of 400 times greater than that of Sirius B, implying that the WD is much hotter and probably hydrogen-rich. This is confirmed by modelling of the WD atmosphere, which shows that T(eff) over 46,000 K. We discuss these results in the context of WDs in general and Sirius-like systems in particular.

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