Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..63..131a&link_type=abstract
Astrophysics and Space Science, vol. 63, no. 1, June 1979, p. 131-154.
Astronomy and Astrophysics
Astrophysics
9
Galactic Radiation, Stellar Luminosity, Transient Response, X Ray Sources, X Ray Stars, B Stars, Binary Stars, Convective Flow, Dwarf Stars, Free Fall, Luminous Intensity, Secular Variations, Stellar Evolution, Stellar Winds
Scientific paper
The galactic distribution and physical nature of X-ray transient sources is considered on the basis of observational data for 41 such sources. The known X-ray transients are divided into two classes: hard transient sources (HTS) and soft transient sources (STS). It is shown that: (1) STS are observed up to a distance of about 15 kpc, and HTS, to about 6-7 kpc; (2) STS are about 0.3 to 0.4 kpc from the galactic plane, while HTS are about 0.1 kpc from the plane; (3) the maximum X-ray luminosity is of the order of 10 to the 38th erg/s for STS and 10 to the 37th erg/s (2-6 keV) for HTS; (4) the frequency of flares in the Galaxy is 4 to 6 per year for STS and 7 to 14 per year for HTS; (5) the number of possible systems is approximately 100-200 for STS and 200 to 400 for HTS; (6) STS are binary systems with red dwarfs and compact stars, while HTS may be binary systems containing Be stars and compact objects; and (7) the flare mechanism involves a secular instability due to periodic modulation of free-fall acceleration in the red dwarf's convection zone for STS and instability of the stellar-wind accretion process for HTS.
Amnuél' P. R.
Guseinov Kh. O.
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