Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60...39t&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 1, Aug. 1977, p. 39-42.
Astronomy and Astrophysics
Astrophysics
5
Gamma Rays, Neutron Stars, Relativistic Plasmas, Stellar Mass Accretion, Stellar Radiation, X Rays, Directivity, Plasma Dynamics, White Dwarf Stars, X Ray Spectra
Scientific paper
Relativistic plasma accretion onto a strongly magnetized neutron star is analyzed in a one-dimensional approximation. It is shown that a radiating accretion column is produced when the plasma velocity is of the order of the free-fall velocity (about 0.3c), that the radius of this column near the neutron-star surface depends on magnetic-field strength, and that the relativistic regime ensures sufficient directional focusing of the radiation from the column. The X-ray spectrum and directivity of the radiation from an accretion column are examined, conditions for hot-spot formation are discussed, and accretion onto a white dwarf is considered. A generation mechanism for X- and gamma-ray bursts is proposed which involves plasma accumulation at the Alfven surface of an obliquely rotating neutron star and the subsequent fast infall of the plasma onto the star itself.
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