Free precession of CYG X-3 and the 34.1-day periodicity

Details Free precession of CYG X-3 and the 34.1-day periodicity Free precession of CYG X-3 and the 34.1-day periodicity

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.115..243s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 115, no. 2, Oct. 1985, p. 243-249.

Astronomy and Astrophysics

Astronomy

3

Gamma Ray Astronomy, Neutron Stars, Periodic Variations, Precession, Stellar Models, X Ray Astronomy, Accretion Disks, Binary Stars, Particle Accelerators

Scientific paper

The origin of the 34.1-day periodicity in X-ray and γ-ray from Cyg X-3 has not been made clear so far. In this paper, the authors propose a free precession model for an elastic neutron star. This model explains the 34.1-day periodicity and predicts the unobserved spin period for Cyg X-3 to be about 100 ms. Taking into account the possibility that the secular spin angular velocity of the star is different from that observed presently, the analogous long-term periodicities of Her X-1 and Cen X-3 are also accounted for in this theory.

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