A Low State Eclipse Spectrum of Hercules X-1 Observed with ASCA

Details A Low State Eclipse Spectrum of Hercules X-1 Observed with ASCA A Low State Eclipse Spectrum of Hercules X-1 Observed with ASCA

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...476l..81c&link_type=abstract

Astrophysical Journal Letters v.476, p.L81

Astronomy and Astrophysics

Astronomy

15

Stars: Binaries: Eclipsing, Stars: Pulsars: Individual Name: Hercules X-1, Stars: Neutron, X-Rays: Stars

Scientific paper

We analyzed the ASCA data of Her X-1 obtained during the "extended low" intensity state on 1993 August 13 and August 28. Both observations cover orbital phases ranging from 0.7 to 1.25 including an X-ray eclipse. We find that the eclipse spectrum is modeled by a single power law with a photon index of 0.8 plus a soft blackbody of kT ~ 0.1 keV in the energy range of 0.5--10 keV. The estimated eclipse flux is (8.1 +/- 0.6) x 10-12 ergs cm-2 s-1 (2--10 keV). The spectral shape is consistent with that obtained from the eclipse data of the "main high" with Ginga, although the flux is reduced by a factor of 3. Similarity of the eclipse spectra between the "low" and "high" state suggests the presence of a steady circumstellar matter surrounding the Her X-1 system. We interpret the flux reduction in the "low" state because of time variations of the X-ray scattering site.

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