Measurement of the spectrum of optical pulsations from HZ Herculis/Hercules X-1

Details Measurement of the spectrum of optical pulsations from HZ Herculis/Hercules X-1 Measurement of the spectrum of optical pulsations from HZ Herculis/Hercules X-1

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..215n&link_type=abstract

Astrophysical Journal, Part 1, vol. 212, Feb. 15, 1977, p. 215-220. ERDA-supported research.

Astronomy and Astrophysics

Astrophysics

11

Binary Stars, Optical Emission Spectroscopy, Pulsed Radiation, Stellar Spectra, X Ray Sources, Atmospheric Heating, Emission Spectra, Line Spectra, Temperature Effects, Wavelengths, X Ray Spectroscopy, X Ray Stars

Scientific paper

We have measured the wavelength dependence of optical pulsations from this system during binary phase 0.18-0.26. These pulsations, which have been shown to originate at the X-ray heated surface of HZ Her, are distributed throughout the optical continuum and have a spectrum similar to that of the unpulsed component. This suggests that the pulsations arise primarily from heating and cooling of the stellar surface, not from emission lines as has been proposed. Emission lines are seen, but are not strongly modulated (less than 7%) and do not contribute significantly to the observed pulsations.

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