Observations of spectral shape changes in Hercules X-1.

Details Observations of spectral shape changes in Hercules X-1. Observations of spectral shape changes in Hercules X-1.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..113...21l&link_type=abstract

Astronomy and Astrophysics Supplement, v.113, p.21

Astronomy and Astrophysics

Astrophysics

12

Stars: Her X-1, Binaries: Close, X-Rays: Stars

Scientific paper

Here the set of Ginga observations of Hercules X-1 are analyzed. Light curves and softness ratios are used to characterize spectral shape changes which occur during the 35-day cycle of Her X-1. Evidence for spectral changes in the high and short-on states is given. The low state is significantly harder in both colors than the high state, the short-on state significantly softer. High state dips follow a locus in the color-color diagram, which is shared also by eclipse ingresses and high state turn off. The same events in the short-on state follow a similar locus, but the locus is shifted to softer colors, which can be explained by a larger component of scattered radiation.

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