Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..85..381f&link_type=abstract
Astrophysics and Space Science, vol. 85, no. 1-2, July 1982, p. 381-387.
Astronomy and Astrophysics
Astronomy
Black Holes (Astronomy), Gravitational Collapse, Stellar Envelopes, Stellar Mass Accretion, X Ray Sources, Absorption Spectra, Infrared Radiation, Neutron Stars, Radiation Absorption, Trapping, Ultraviolet Radiation
Scientific paper
It is suggested that an X-ray source of Population II is produced by gas accreting onto a collapsed star from an extended quasi-transparent envelope formed in the distant past in a collision with a normal star. Most of the envelope is only weakly ionized; energy balance and hydrostatic equilibrium are ensured mainly by secondary line radiation, which is trapped there for very long times before it escapes or is reabsorbed. However, in the fully ionized innermost regions of the envelope the atomic particles that can absorb and reemit line radiation are not present and matter steadily accretes onto the black hole, producing the primary X-rays. On the basis of the mechanism that controls the escape of line photons, two types of lines are distinguished: the first falls in the visible or infrared and appears in emission, while the second results exclusively from allowed transitions and falls in the ultraviolet, appearing as very broad absorption lines.
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