Can we expect a freely precessing neutron star in HER X-1?

Details Can we expect a freely precessing neutron star in HER X-1? Can we expect a freely precessing neutron star in HER X-1?

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...221l...7b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 221, no. 1, Aug. 1989, p. L7-L9.

Statistics

Computation

5

Accretion Disks, Magnetic Stars, Neutron Stars, Stellar Rotation, X Ray Binaries, Angular Velocity, Computational Astrophysics, Moments Of Inertia, Precession, Stellar Models

Scientific paper

The possibility of a freely precessing neutron star in Her X-1 is explored, and a theoretical analysis indicates that rotating magnetized neutron stars generally possess the form of either an aligned symmetrical top or a three-axis figure. Difficulties in the formation of the inclined symmetrical top necessary for the free precession model are pointed out. A formula for the observed period variation due to free precession is proposed. Although the variations of the pulse shape during the 35-day cycle of Her X-1 cannot be explained by free precession, they can be explained by a model of a precessing accretion disk.

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