The 35 day cycle of Hercules X-1

Details The 35 day cycle of Hercules X-1 The 35 day cycle of Hercules X-1

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209..556b&link_type=abstract

Astrophysical Journal, vol. 209, Oct. 15, 1976, pt. 1, p. 556-561. Research supported by the National Research Council.

Astronomy and Astrophysics

Astrophysics

6

Eclipsing Binary Stars, Periodic Variations, Stellar Models, X Ray Sources, X Ray Stars, Lagrangian Equilibrium Points, Mass Transfer, Orbital Elements, Phase Locked Systems, Stellar Mass

Scientific paper

Current models for the eclipsing X-ray binary Hercules X-1 appear inadequate to account properly for the 35-day cycle of X-ray on and off periods, particularly its phase lock with orbital cycle. The observations can be explained by a model in which cessation of detectable X-ray emission is caused by occultation by circumstellar gas streams leaving the binary system through the outer Lagrange points. The specific values of the turn-on phases appear to be an accident of orbital inclination.

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