Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62..149f&link_type=abstract
Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 149-157.
Astronomy and Astrophysics
Astronomy
12
Galactic Bulge, Galactic Radiation, Galactic Structure, Globular Clusters, Stellar Envelopes, Stellar Mass Accretion, X Ray Sources, Astronomical Models, Black Holes (Astronomy), Neutron Stars, Stellar Models, Stellar Structure
Scientific paper
It is suggested that the X-ray sources in globular clusters and in the galactic bulge are formed in collisions of compact objects (neutron stars or perhaps black holes) and normal stars. The two stars would coalesce after the collision and the normal star would form a thick envelope around the compact object. Absorption of X-rays from the accreting compact object would cause the envelope to expand gradually until it evolves into a transparent envelope; the small fraction of the X-rays that are absorbed by the envelope would be reradiated at longer wavelengths. The rate of formation of X-ray sources by collisions is calculated, and, in the context of certain assumptions, the rate satisfactorily accounts for the number and the space distribution of the sources in the bulge. In globular clusters, collisions seem to produce many more sources than are actually observed.
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