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Optical pulsations from HZ Herculis/Hercules X-1 - The self-consistent 35 day picture
Middleditch, J.
AA(Los Alamos National Laboratory, Los Alamos, NM)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 278-291. Research sponsored by the U.S. Department of Energy. (ApJ Homepage)
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NASA/STI Keywords:
Eclipsing Binary Stars, Light Emission, Stellar Oscillations, X Ray Sources, Mass Transfer, Roche Limit, Stellar Mass Accretion, Stellar Models
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Optical pulsation data on the HZ Her/Her X-1 system obtained with the Lick (61-cm), Crossley (91-cm), and Shane (3.1-m) telescopes since 1974 are combined with published optical and X-ray observations and analyzed. The results are presented in tables, graphs, and diagrams. It is shown that the features of the optical pulsation velocities not explained by the occasional (every 0.81 days for 4 h or more) and predictable influence of the mass-transfer-stream X-ray shadow and the disk-rim structure on the lobe of HZ Her can be described by a single-valued function of the 1.7-day run-centroid orbital phase. The mass of Her X-1 is found to have an upper limit of 1.4 solar mass, and assumptions of its prograde spin, and of aligned corotation and Roche-lobe filling for HZ Her, are verified.

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