On the correlation between hardness and pulsation in galactic X-ray sources

Details On the correlation between hardness and pulsation in galactic X-ray sources On the correlation between hardness and pulsation in galactic X-ray sources

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..819m&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Sept. 15, 1977, p. 819-821.

Astronomy and Astrophysics

Astronomy

12

Binary Stars, Compton Effect, Stellar Radiation, X Ray Sources, Early Stars, Giant Stars, Neutron Stars, Photons, Spaceborne Astronomy, Stellar Envelopes, Stellar Luminosity, Stellar Magnetic Fields, Supergiant Stars

Scientific paper

It is pointed out that for galactic X-ray sources there exists an observational association between hard spectra (kT at least about 20 keV), pulsation, and early-type optical counterparts. The absence of pulsation in soft X-ray sources is attributed to the fact that photons produced at the surface of a magnetic neutron star are Compton scattered in a surrounding cloud which is heated by the Compton energy losses of the hardest photons.

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