Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276..607l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 2, pp. 607-613.
Astronomy and Astrophysics
Astronomy
8
Stars: Neutron, Pulsars: Individual: Her X-1-X-Rays: Stars
Scientific paper
An ingress of Hercules X-1 was observed with the Ginga satellite during a high state of the 35-d cycle in 1989. The ingress spectra show absorption by the atmosphere of the companion star HZ Her. The decrease of iron-like intensity during ingress shows that the iron-emitting region is smaller than a few times 10^8 cm. The eclipse period shows emission at about 1 per cent of the high-state level, due to scattering by extended matter. We find, at the 2sigma level, an iron emission line in the eclipse spectrum. Modelling of the eclipse ingress light curve and change in softness ratio is carried out. We find a low-density region with scale-hight of 5-6x10^8 cm, but also find a higher-density region with scaleheight 3x10^8 cm. The high- and low-density regions are argued to be the hydrostatic part of the atmosphere and a transition region, respectively. The transition region is the base of an ionized wind which is responsible for producing the mid-eclipse X-ray flux.
Leahy Denis A.
Yoshida Akio
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