The corona around the white dwarf Sirius B determined from X-ray measurements.
Abstract
Summary. The X-ray measurements from Sirius are explained as emission from a corona around the white dwarf Sirius B. Minimum flux calculations suggest that the corona has a temperature of 3.3 106 0K and a base pressure of 1.3 10 dyn . The energy needed to heat the corona is estimated at 8 1011 erg 1 This is consistent with the acoustic flux calculated with the assumption that Sirius B has a helium convection zone. This would mean that the hydrogen rich envelope is very thin and perhaps supports the suggestion that it is formed by accretion. Key words: stellar coronae X-rays white dwarfs
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 1976
- Bibcode:
- 1976A&A....50..319H
- Keywords:
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- Coronas;
- Stellar Atmospheres;
- White Dwarf Stars;
- X Ray Astronomy;
- Astronomical Netherlands Satellite;
- Spaceborne Astronomy;
- Stellar Temperature;
- Astrophysics