Period variations in pulsating X-ray sources. I - Accretion flow parameters and neutron star structure from timing observations

Details Period variations in pulsating X-ray sources. I - Accretion flow parameters and neutron star structure from timing observations Period variations in pulsating X-ray sources. I - Accretion flow parameters and neutron star structure from timing observations

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..969l&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Sept. 15, 1978, p. 969-987. Research supported by the United States-Israel Binational

Other

58

Binary Stars, Neutron Stars, Periodic Variations, Stellar Mass Accretion, Stellar Structure, X Ray Sources, Angular Velocity, Companion Stars, Equations Of Motion, Graphs (Charts), Magnetic Stars, Mass Flow, Pulse Duration, Stellar Atmospheres, Stellar Models, Stellar Rotation, Tables (Data), Torque, Vortices

Scientific paper

Torque fluctuations which can lead to variations in the periods of pulsating X-ray sources are examined. A description of torque variations in terms of noise processes is developed, and the resulting noise models are applied to observations of several pulsating X-ray sources. It is shown that fluctuations in accretion torque could account for the observed period variations and spindown episodes in Her X-1 and Cen X-3. The values of the torque noise strengths inferred from either a nonresonant response or, in the case of Her X-1, a Tkachenko-mode interpretation of the data are found to be consistent with those expected from processes at the magnetospheric boundary of an accreting neutron star. Ways to distinguish among the various interpretations of the period variations are considered. It is noted that fluctuating mass-flow rates may be responsible for other phenomena observed in compact X-ray sources, such as wobble with zero initial amplitude and binary period variations in close binary systems experiencing mass transfer.

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