On fast X-ray rotators with long-term periodicities

Details On fast X-ray rotators with long-term periodicities On fast X-ray rotators with long-term periodicities

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..487n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 487-495.

Astronomy and Astrophysics

Astrophysics

9

Binary Stars, Magellanic Clouds, Neutron Stars, Stellar Rotation, X Ray Sources, Accretion Disks, Earth Magnetosphere, Heao 2, Magnetic Stars, Precession, Sas-3, Space Commercialization, Stellar Mass Accretion

Scientific paper

The support of previous SAS 3 spacecraft observations by new data gathered by the Monitor Proportional Counter aboard the HEAO 2 spacecraft indicates that the pulse period history of the 13.5 sec-pulsing X-ray source LMC X-4 is consistent with standard accretion and torque models only if LMC X-4 is a fast rotator for which the accretion torques nearly cancel. This result leads to a neutron star magnetic field strength estimate of about 1.2 x 10 to the 13th G. Strong evidence is noted for Her X-1's status as a fast rotator, while SMC X-1 is probably an intermediate-to-fast rotator. In the context of slaved disk models for these objects, it is noted that the precession periods expected for the companion stars are significantly longer than the observed 1-2 month time scales; slaved disk models are thereby undermined.

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