A soft X-ray source in the vicinity of the Am star HR 976.
Abstract
SUMMARY A region of 34' in diameter around the position of BR976 (= BD20210) was observed with the soft and medium energy X-ray instrument on-board ANS. A 3.Sa signal in the 0.16-0.284 kev interval and an upper limit in the 1-3.5 keV interval was obtained. Tentatively identifying this X-ray source with HR976 (at a distance of about 53 pc) yields an X-ray luminosity of 2.0 (I 1) 1030 erg/s (0.16-0.284 keV) and a 3a-upper limit < 1.3 1031 erg/s (1-3.5 kev). Various X-ray emission mechanisms are considered. If the observations are explained as emission from a corona around the primary of BR976, minimum-f lux calculations indicate coronal temperatures in the range (2-3) 106 K. The energy flux to heat such a corona would be in the range (1-10) l0 erg/cm2.s. Key words: X-rays - Am stars - spectroscopic binaries.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 1978
- Bibcode:
- 1978A&A....67L..29D
- Keywords:
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- Binary Stars;
- Satellite Observation;
- X Ray Astronomy;
- X Ray Stars;
- Astronomical Netherlands Satellite;
- Companion Stars;
- Coronas;
- X Ray Apparatus;
- Astrophysics;
- X-Ray Sources:Optical Identifications