GINGA Observations of a Wolf-Rayet Star HD 193793
Abstract
X-ray observations of a massive binary Wolf-Rayet star HD 193793 were carried out with the Large Area proportional Counters (LAC) 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 *E(-11) erg s(-1) cm(2) in the energy band 2--6 keV with a N_H value smaller than 5 times 10(21) H cm(-2) . We detected an emission line at 6.6 +/- 0.2 keV with an equivalent width of 0.3 +/- 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 multi-temperature thin thermal plasma. The X-ray luminosity did not show any large amplitude variations throughout a wide range of the binary phase.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- February 1990
- Bibcode:
- 1990PASJ...42L...1K
- Keywords:
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- Binary Stars;
- Ginga Satellite;
- Wolf-Rayet Stars;
- X Ray Spectra;
- Absorption Spectra;
- Exosat Satellite;
- High Temperature Plasmas;
- Stellar Luminosity;
- Stellar Spectra;
- Astrophysics;
- HD 193793;
- WOLF-RAYET STAR;
- X-RAY SPECTRUM