Gamma Cassiopeiae and the transient X-ray source MX0053+60

Details Gamma Cassiopeiae and the transient X-ray source MX0053+60 Gamma Cassiopeiae and the transient X-ray source MX0053+60

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pasp...89..122m&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 89, Apr.-May 1977, p. 122-126. Research supported by the National Resear

Astronomy and Astrophysics

Astronomy

17

Stellar Atmospheres, Variable Stars, X Ray Sources, Astronomical Models, B Stars, Bremsstrahlung, Coronas

Scientific paper

In order to test the possibility that Gamma Cas might be the optical counterpart of the transient X-ray source MX 0053+60, a model is evaluated in which the X-ray emission arises due to bremsstrahlung in an optically thin coronal-like region surrounding the star. Evidence for such regions associated with early-type stars is reviewed, and the proposed emission mechanism is analyzed. The results show that if Gamma Cas is MX 0053+60 and the X-ray emission does not arise from accretion onto a compact object, then bremsstrahlung in a coronal-like volume around the star requires a temperature of at least 20 million K, an electron density not exceeding 100 billion per cu cm, and a larger outer than inner emission-volume radius. Several difficulties associated with this model are briefly discussed.

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