Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.259..292m&link_type=abstract
Nature, vol. 259, Jan. 29, 1976, p. 292, 293.
Astronomy and Astrophysics
Astronomy
60
B Stars, Binary Stars, Stellar Mass Ejection, X Ray Astronomy, X Ray Stars, Neutron Stars, Stellar Mass, Stellar Radiation, Stellar Spectra
Scientific paper
X-ray emission from binary systems containing Be stars is discussed. It is shown that Be stars are appealing candidates for transient X-ray sources because: (1) a number of these stars are single-line spectroscopic binaries with periods of the order of 10 days; (2) compact stars can be formed as companions of main-sequence stars with masses as low as 8 to 10 solar masses, which corresponds to B3 or B4 spectral types; and (3) Be stars characteristically show a central absorption component in the Balmer lines, indicating the presence of circumstellar material. It is proposed that sudden variations in the rate of mass ejection from Be stars in the presence of a compact companion (a neutron star) could produce transient X-ray emission which might recur over a period of years in the same way as the observed optical emission from Be stars. X-ray systems identified with objects optically similar to Be stars include A1118-61, A0535 plus 26, 3U 0352 plus 30 (X Per), and Cen X-3. The X-ray behavior of the last two sources is reviewed, and it is suggested that Be transients in a quiescent state should be approximately as numerous as steady galactic X-ray sources.
Maraschi Laura
Treves Aldo
van den Heuvel Edward Peter Jacobus
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