Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..149w&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 94, Feb. 1982, p. 149-156. Research sponosred by the Koninklijke Nederla
Astronomy and Astrophysics
Astronomy
22
Binary Stars, Stellar Spectrophotometry, Ultraviolet Astronomy, Variable Stars, X Ray Binaries, X Ray Sources, Astronomical Netherlands Satellite, Interstellar Extinction, Light Curve, Stellar Spectra
Scientific paper
Complete ultraviolet light curves for HZ Her immediately after a well-defined X-ray turn-on in 1975 are obtained. The features of the curve are found to correspond well with features seen in the optical. The absolute level of emission at maximum light at 1550 A is in good agreement with the calculations of the X-ray reflection effect of Milgrom and Salpeter (1975). It is found that at 1550 A approximately 20% of the light at maximum comes from the accretion disk. Similar observations of Cyg X-1 make it possible to determine the degree of reddening, equivalent to E(B-V) = 0.95 + or - 0.07, from the strength of the 2200 A interstellar absorption feature. The distance inferred from this amount of reddening requires that the optical star be luminous and, therefore, massive. Observations obtained during the May 1975 X-ray transition show ultraviolet excess when compared with the data obtained six months later.
Eaton Joel A.
Hammerschlag-Hensberge Godelieve
Holm Albert V.
Milgrom Mordehai
Wu Congjun
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