Evidence for a 35 day precession in the orbit of Hercules X-1

Details Evidence for a 35 day precession in the orbit of Hercules X-1 Evidence for a 35 day precession in the orbit of Hercules X-1

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213l..57f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 213, Apr. 15, 1977, p. L57-L60.

Astronomy and Astrophysics

Astrophysics

12

Binary Stars, Precession, Pulsars, Stellar Motions, X Ray Sources, X Ray Stars, Angular Momentum, Astronomical Models, Circular Orbits, Orbital Elements, Orbital Velocity, Pulsed Radiation, Uhuru Satellite

Scientific paper

If the binary orbital plane of Hercules X-1 precesses, the X-ray pulse arrival times from this source will display additional periodicities corresponding to sidebands of the precessional and orbital periods. A search of Uhuru data from the January and March 1972 on states of Her X-1 yields marginal evidence for precessional motion, with a periodic shift in pulse arrival time having an amplitude of about 0.03 sec and a period of approximately 1.6 days, which corresponds to a variation in orbital inclination having an angular amplitude of at least 1 deg of arc and a precessional period of approximately 35 days. This evidence lends support to a class of models wherein the 35-day on-off cycle of Her X-1 is due to variable obscuration by a wobbling accretion disk.

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