EXOSAT observations of the 35 day cycle of Hercules X-1 Evidence for neutron star precession

Details EXOSAT observations of the 35 day cycle of Hercules X-1 Evidence for neutron star precession EXOSAT observations of the 35 day cycle of Hercules X-1 Evidence for neutron star precession

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300l..63t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. L63-L67.

Astronomy and Astrophysics

Astrophysics

110

Neutron Stars, Precession, Satellite Observation, X Ray Binaries, Accretion Disks, Exosat Satellite, Light Curve

Scientific paper

Her X-1 was observed with Exosat throughout a 35 day cycle at about 4 day sampling intervals. These measurements include, for the first time, an accurate determination of the 1.24 s pulse profiles during the short-on state at the middle of the 35 day cycle. The data show a large change in the pulse profiles between the main and short-on states, suggesting a precession of the magnetic dipole axis of the rotating neutron star. It is proposed that the clock mechanism resides in the free precession of the neutron star, and consequences of this precession with respect to the structure of the inner accretion disk are examined.

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