EXOSAT and IUE observations of contact binaries

Abstract

view Abstract Citations (30) References (59) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS EXOSAT and IUE Observations of Contact Binaries Vilhu, O. ; Heise, J. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1986 DOI: 10.1086/164831 Bibcode: 1986ApJ...311..937V Keywords: Satellite Observation; Spaceborne Astronomy; Stellar Coronas; Stellar Spectrophotometry; X Ray Binaries; Abundance; Emission Spectra; Exosat Satellite; Iue; Light Curve; Ultraviolet Spectra; Astrophysics; STARS: BINARIES; ULTRAVIOLET: SPECTRA; X-RAYS: BINARIES full text sources ADS | data products SIMBAD (7) MAST (1) INES (1)