Other
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.266..683r&link_type=abstract
Nature, vol. 266, Apr. 21, 1977, p. 683-685. Research supported by the Alfred P. Sloan Foundation and NASA.
Other
146
Angular Momentum, Momentum Transfer, Pulsars, Stellar Mass Accretion, Stellar Rotation, X Ray Stars, Neutron Stars, Torque, White Dwarf Stars
Scientific paper
An analysis of the accretion process in an X-ray pulsar, whereby angular momentum is transferred to the star and its rotation period is changed, is presented, and an expression for the fractional rate of change of the pulse period in terms of X-ray luminosity and other star parameters is derived. It is shown that observed characteristic spin-up time scales for seven X-ray pulsars strongly support the view that in every source (1) the pulse period reflects the rotation period of a compact object, (2) the accretion is mediated by a disk surrounding the compact object and rotating in the same sense, and (3) the compact object is a neutron star rather than a white dwarf.
Joss Paul C.
Rappaport Saul
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