UBV light curves of HZ Herculis - The 35-day cycle behavior

Details UBV light curves of HZ Herculis - The 35-day cycle behavior UBV light curves of HZ Herculis - The 35-day cycle behavior

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....35..407c&link_type=abstract

Astronomy and Astrophysics, vol. 35, no. 3, Oct. 1974, p. 407-415. Research supported by the Universite de Paris VII and Centre

Astronomy and Astrophysics

Astronomy

16

Binary Stars, Light Curve, Ubv Spectra, Variable Stars, X Ray Astronomy, X Ray Stars, Electrophotometry, Periodic Variations, Reflecting Telescopes, Tables (Data), Ultraviolet Radiation

Scientific paper

Standard UBV photoelectric observations of HZ Herculis were made using the 60 cm and 80 cm reflectors at Haute Provence Observatory to search for effects correlated with the 35-day 'ON-OFF' cycle of the associated pulsating binary X-ray source Hercules X-1. The U-B index undergoes marked changes throughout the cycle while the B-V index shows little dependence on the 35-day phase. An ultraviolet extended region whose size, brightness, and/or relative location change over several days is hypothesized to explain observed phenomena. A common cause, possibly rotation of the X-ray beam, is suggested for the ultraviolet peak and the X-ray emission.

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