Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..163g&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, Apr. 1, 1980, p. 163-168. Research supported by the European Space Agency, Science Res
Astronomy and Astrophysics
Astronomy
25
Binary Stars, Spaceborne Astronomy, Stellar Spectrophotometry, Ultraviolet Spectra, X Ray Sources, Continuous Spectra, Emission Spectra, Iue, Light Curve, Line Spectra, Ultraviolet Astronomy
Scientific paper
The results of a campaign of monitoring HZ Her with the IUE satellite are presented. The spectrum and light variation outside of eclipse are consistent with the Milgrom and Salpeter model for emission from the X-ray heated photosphere of the primary. Near eclipse there is UV flux in excess of the prediction of the heated photosphere model, which shows significant 35 day variations and is consistent with an origin in a precessing disk, as described by Gerend and Boynton. The spectrum shows the strong emission lines of N V and C IV, which generally vary in the sense of the continuum. The N V/C IV ratio is greater than 2 near orbital phase 0.5 and approaches unity near eclipse. It is suggested that these emission lines are optically thick and arise from both the heated photosphere and the accretion disk.
Black John
Burger Marc
Davis Raymond Jr.
de Loore Camiel
Dupree Andrea K.
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