Coordinated observations of optical and X-ray pulsations from Hercules X-1

Details Coordinated observations of optical and X-ray pulsations from Hercules X-1 Coordinated observations of optical and X-ray pulsations from Hercules X-1

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..592j&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Jan. 15, 1980, p. 592-594. Research supported by the U.S. Department of Energy;

Astronomy and Astrophysics

Astrophysics

16

Binary Stars, Neutron Stars, X Ray Stars, Astronomical Spectroscopy, Periodic Variations, Stellar Mass Accretion

Scientific paper

Optical and X-ray pulsations from Hercules X-i were observed during the 1977 July/August high state of the source. Some of the optical pulsations apparently originated near the line of sight from the neutron star to the Earth. The X-ray pulse timing observations were sufficiently accurate and adjacent in time to the optical observations that a direct comparison of the optical and X-ray pulse arrival times is possible. If these optical pulsations originate within ∼109 cm of the neutron star, then they are emitted in phase with the X-ray pulsations, to within the measurement errors. However, it seems more likely that the optical pulsations originate in a region of enhanced density near the intersection of the accretion disk with an accretion stream from the companion star, HZ Herculis; this region should have been approximately along the line of sight from the neutron star to the Earth at the time of the observations. We use the X-ray timing data to refine the measured spin-up rate of the neutron star and the orbital parameters of the binary system.

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