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OSO-8 observations of Hercules X-1 (1976)

Becker, R. H. ; Pravdo, S. H. ; Rothschild, R. E. ; [et al.]

In: CASI

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Publication Date: 2006-04-18

Description: The X-ray binary Her X-1 was observed by the GSFC cosmic X-ray detectors aboard OSO-8 between August 26 and September 3, 1975. The results reported are based on quick look tapes which contain less than 10% of the total time spent on source. Spectra were observed during different phases of the binary period including the anomalous low state (dip) in X-ray intensity. The normal high spectra is well represented by a power law with a short cutoff above approximately 25 keV. A significant and varying enhancement in the intensity around 6.7 keV was observed, suggesting the presence of an iron line. Absorption was seen in the spectrum immediately following eclipse. The dip spectrum is found to be considerably flattened. Also spectra are presented for different phases of the pulse period.

Keywords: ASTRONOMY

Type: X-ray Binaries; p 161-168

Format: text

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