OSO-7 hard X-ray observations of 3U 0352+30 = X Persei

Details OSO-7 hard X-ray observations of 3U 0352+30 = X Persei OSO-7 hard X-ray observations of 3U 0352+30 = X Persei

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211l.129m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 211, Feb. 1, 1977, p. L129-L133.

Astronomy and Astrophysics

Astronomy

21

B Stars, Galactic Radiation, Oso-7, X Ray Sources, Bremsstrahlung, Spaceborne Astronomy, Stellar Models

Scientific paper

Results are reported for OSO 7 observations of 3U 0352+30 (X Per) over the energy range from 7 to 110 keV. It is found that this source has either a hard power-law spectrum or a thermal bremsstrahlung spectrum over the observed energy range, indicating that X Per may be the prototype of a new class of weak galactic hard X-ray sources. The data are shown to be consistent with spectra calculated for accretion onto a degenerate dwarf of at least 1 solar mass. Geometrical and dynamical constraints are considered for a model in which an accreting degenerate dwarf is in a close orbit about the primary of X Per, and it is concluded that such a model is not ruled out at present. It is suggested that X-ray sources associated with Be stars may make a significant contribution to the diffuse hard X-ray background in the galactic plane.

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