Hard X-rays from the contact binary VW Cephei

Details Hard X-rays from the contact binary VW Cephei Hard X-rays from the contact binary VW Cephei

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..192t&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 15, 1992, p. 192-196.

Astronomy and Astrophysics

Astronomy

13

Binary Stars, Light Curve, X Ray Sources, Exosat Satellite, Proportional Counters, Spaceborne Astronomy, Stellar Models, Stellar Spectra

Scientific paper

Ginga observations of the contact binary VW Cep are presented. The observed X-ray luminosity is 1.1 x 10 exp 30 erg/s in the energy range of 2-10 keV, assuming a distance of 31 pc. No evidence for X-ray orbital modulation or for flare events was detected. The observed X-ray spectrum is very hard, and can be represented well either by a thermal bremsstrahlung model with a temperature of 11.2 +40/-2.3 keV or a power-law model with a photon index of 1.90 +0.24/-0.20. These observational results are interpreted in terms of the thermal emission from a hot coronal plasma extending beyond the stellar size. The observed upper limit on the iron K-line intensity is considerably lower than the theoretical prediction.

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