Physics
Scientific paper
Aug 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pthph..50..459h&link_type=abstract
Progress of Theoretical Physics, Vol. 50, No. 2, pp. 459-471
Physics
8
Scientific paper
Matter accretion onto compact stars has been considered as a likely process of X-ray emission form stellar X-ray sources. The accreting matter forms a circumstellar envelope that absorbs a part of X-rays emitted from the central star. The ionization equilibrium due to the photoionization by X-rays and the recombination with electrons is calculated, and the optical depth for X-ray absorption is obtained as a function of the mass and radius of the central star, the absolute luminosity and the spectrum of X-rays. The K-absorption of oxygen and the L-absorption of iron are found to be responsible for the reduction of the X-ray intensity in the energy range 0.9 ˜ 3 keV. This is not in favour of the interpretation of Sco X-1 in terms of the accretion model, whereas the circumstellar absorption explains the X-ray spectrum of Cen X-3, thus further supporting the model that Cen X-3 is a neutron star belonging to a close binary system.
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