Discovery of iron line emission in the Hercules X-1 low-state spectrum with HEAO 1

Details Discovery of iron line emission in the Hercules X-1 low-state spectrum with HEAO 1 Discovery of iron line emission in the Hercules X-1 low-state spectrum with HEAO 1

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225l..53p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Oct. 15, 1978, p. L53-L58.

Astronomy and Astrophysics

Astronomy

17

Binary Stars, Emission Spectra, Iron, Spaceborne Astronomy, X Ray Spectra, X Ray Stars, Heao 1, Line Spectra, Secondary Emission, Spectral Line Width

Scientific paper

Results are reported for HEAO 1 observations of Her X-1 which confirm the existence of the iron line-emission feature discovered with OSO 8 in the high-state spectrum and also reveal an iron emission feature in the low-state spectrum. The iron line-emission feature in the low-state spectrum was detected at a significance level greater than 5 sigmas and is characterized by a line energy of 6.4 keV, an equivalent width larger than that of the high-state line, a binary phase dependence of the line intensity, and a line width that is intrinsically narrow in contrast to the broad high-state line. The observed line energy and narrow line width are shown to be consistent with an interpretation in terms of fluorescence emission due to X-ray heating. It is suggested that HZ Her contributes no more than about 10% of the predicted line flux, that this emission is reflected from a highly ionized plasma, and that a hot coronal gas is an important source of the low-state X-rays.

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