ANS: evidence for soft X-ray emission from the binary HR 976.
Abstract
Observations of the region around the single-lined spectroscopic binary HR 976 are reported which were made with the soft (0.16-0.284 keV) and medium-energy (1-8 keV) X-ray detectors aboard ANS. A mass of 1.7 solar masses and a radius of 1.56 solar radii are derived for the Am primary star, and a distance of 53 pc is adopted. A soft X-ray luminosity of (2 + or - 1) x 10 to the 30th erg/s is obtained, along with a 3-sigma upper limit of 1.3 x 10 to the 31st erg/s for the range from 1 to 3.5 keV. The possibility of X-ray emission from a corona around the Am primary is investigated on the basis of the minimum-flux model. It is shown that the soft X-ray observations are consistent with a minimum-flux corona having a temperature of 2 to 3 million K, a base pressure of 5 to 20 dyne/sq cm, and a mechanical flux of 100 million to 1 billion erg/sq cm-sec.
- Publication:
-
X-ray Astronomy
- Pub Date:
- 1979
- Bibcode:
- 1979xras.proc..193D
- Keywords:
-
- Astronomical Netherlands Satellite;
- Astronomical Spectroscopy;
- Binary Stars;
- X Ray Astronomy;
- X Ray Sources;
- Base Pressure;
- Flux Density;
- Line Spectra;
- Stellar Coronas;
- Stellar Luminosity;
- Stellar Temperature;
- X Ray Spectra;
- Astrophysics;
- Spectroscopic Binaries:X Rays;
- Stellar Coronae:X Rays