EXOSAT and IUE observations of contact binaries

Details EXOSAT and IUE observations of contact binaries EXOSAT and IUE observations of contact binaries

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..937v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. 937-946. Research supported by the Fulbright Foundat

Astronomy and Astrophysics

Astronomy

26

Satellite Observation, Spaceborne Astronomy, Stellar Coronas, Stellar Spectrophotometry, X Ray Binaries, Abundance, Emission Spectra, Exosat Satellite, Iue, Light Curve, Ultraviolet Spectra

Scientific paper

EXOSAT observations are reported of the contact binaries W UMa, VW Cep, 44t Boo, XY Leo, and V566 Oph and the detached short-period RS CVn stars ER Vul and HD 209943. Complete X-ray light curves were obtained for W UMa, VW Cep and 44t Boo. Nearly simultaneous IUE observations of VW Cep provide important comparisons of the Mg II emission, the UV continuum, and the FES light curve, pointing to extra hot gas at phase 0.75. The observations indicate that contact binaries have highly structured (in temperature and geometry) and highly variable coronae, not preferentially connected with either of the component stars. The observed dips can be interpreted as due to cool absorbing clouds above localized X-ray emitting regions. For VW Cep, 44t Boo, and XY Leo there is evidence that the neck regions are sites for X-ray-emitting hot gas.

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