Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..652c&link_type=abstract
Astrophysical Journal, Part 1, vol. 222, June 1, 1978, p. 652-663.
Astronomy and Astrophysics
Astrophysics
14
Binary Stars, Stellar Atmospheres, Stellar Mass, X Ray Sources, Albedo, Atmospheric Models, Light Emission, Periodic Variations
Scientific paper
A formalism is presented that enables one to calculate the amount of pulsed optical radiation emergent from a stellar atmosphere exposed to pulsed X-rays. The formalism takes account of the time evolution of the X-ray energy deposited in a time-independent atmosphere. For HZ Her, the calculated optical pulsation agrees with the observed amplitude. For fixed system parameters, allowable nonuniform X-ray beams can cause the amplitude of the optical pulsation to vary by a factor of 2 and can shift the frequency of the pulsation, and hence the inferred optical velocity. The presence of soft X-rays (0.1-1 keV) can significantly affect the calculated pulsation amplitude. This dependence constrains any possible soft X-ray flux that may fall on the surface of HZ Her. The assumption of corotation along with limits from the optical pulsation data give a mass range of about 0.8-1.6 solar masses for Her X-1. If the light curve observed during the extended lows of HZ Her is due to ellipsoidal variation, this range may be further restricted.
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