GINGA observations of a Wolf-Rayet star HD 193793

Details GINGA observations of a Wolf-Rayet star HD 193793 GINGA observations of a Wolf-Rayet star HD 193793

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42l...1k&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 1, 1990, p. L1-L5.

Other

18

Binary Stars, Ginga Satellite, Wolf-Rayet Stars, X Ray Spectra, Absorption Spectra, Exosat Satellite, High Temperature Plasmas, Stellar Luminosity, Stellar Spectra

Scientific paper

X-ray observations of the massive binary Wolf-Rayet star HD 193793 were carried out with the large-area proportional counters onboard the Ginga satellite between August 1987 and 1988. The X-ray intensities and spectra were measured 1 year apart and were found to be very similar to each other. The X-ray luminosities were about 1.5 x 10 to the -11th erg/s sq cm in the energy band 2-6 keV with an NH value smaller than 5 x 10 to the 21st H/sq cm. An emission line at 6.6 + or - 0.2 keV was detected, with an equivalent width of 0.3 + or - 0.1 keV, which is attributable to the K line from highly ionized iron in a thin hot plasma. The overall spectrum can be explained in terms of a multitemperature thin thermal plasma. The X-ray luminosity did not show any large amplitude variations throughout a wide range of the binary phase.

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