The effects of the 35-day X-ray cycle on the light curve of HZ Herculis.
Abstract
We report extensive photoelectric UB V photometry of the variable star HZ Her, originally undertaken to discover possible correlations between variations in its 1.7-day light curve and the 35-day cycle of the X-ray source Her X-1. Correlations recently reported by other groups are confirmed. These, as well as other features observed, are provisionally analyzed using a model consisting of a primary star filling its Roche lobe and being illuminated by X-rays. The X-rays are emitted in a beam fixed in a rotating, precessing, neutron-star secondary. Additional light is being contributed by material being transferred from the primary to the secondary. Subject headings: binaries - stars, individual - X-ray sources
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1974
- DOI:
- 10.1086/152886
- Bibcode:
- 1974ApJ...190..365G