Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.266..123r&link_type=abstract
Nature, vol. 266, Mar. 10, 1977, p. 123-125. NASA-supported research.
Other
37
Binary Stars, Pulsars, Stellar Mass Accretion, Stellar Models, X Ray Sources, Neutron Stars, Stellar Magnetic Fields, Stellar Temperature, X Ray Spectra
Scientific paper
Recent progress in the study of the pulse profiles of the nine known binary X-ray pulsars is discussed. The sources considered include SMC X-1, Her X-1, Cen X-3, A0535+26, GX1+4, 3U 0900-40, A1118-61, GX301-2, and 3U 0352+30. Sample X-ray profiles for these sources are provided, and general features exhibited by the profiles are identified. It is noted that the apparent existence of a gap in the period distribution of X-ray pulsars, in the range from about 5 to 100 sec, seems to be genuine within obvious statistical limitations and is probably not an observational effect. Two explanations for the production of X-ray pulsations are examined: one requiring a temporal modulation of mass accretion onto the surface of a neutron star and another requiring the funnelling of matter along magnetic field lines to the neutron star's surface.
Joss Paul C.
Rappaport Saul
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