Optical pulsation from the HZ Her/Her X-1 system

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Pulsed Radiation, X Ray Sources, Astronomical Models, Light Emission, Stellar Atmospheres

Scientific paper

A theoretical model for the observed optical pulsation from the X-ray binary HZ Her/Her X-1 is presented. Its foundation is a general computer code for a X-ray illuminated stellar atmosphere. Detailed results are given for several atmospheres applicable to HZ Her. A formalism was developed to calculate the amount of pulsed optical radiation emergent from these atmospheres if they are exposed to pulsed X-rays. This formalism was used to calculate the pulsed and unpulsed optical light curves for HZ Her. The calculated optical pulsation agrees with the observed amplitude.

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