Phase dependence of the line feature in the hard X-ray spectrum of Hercules X-1

Details Phase dependence of the line feature in the hard X-ray spectrum of Hercules X-1 Phase dependence of the line feature in the hard X-ray spectrum of Hercules X-1

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ans..conf..125v&link_type=abstract

In its Accreting Neutron Stars p 125-129 (SEE N83-15179 05-88)

Physics

Hercules Nova, Line Spectra, Phase Coherence, Pulsars, Pulse Rate, X Ray Sources, Gamma Ray Bursts, Light Curve, Pencil Beams, Spectrum Analysis, X Ray Spectra

Scientific paper

The hard X-ray spectrum of Hercules X-1 in the energy range 26-120 keV was measured during a 4.4 hr balloon observation on 1977 September 3 with a large phoswich detector system. The spectral feature in the 1.24 s pulsations found in a 1976 observation was detected again and confirmed with large significance. The line feature is either located at 52 keV (as an emission line) or at 38 keV (as an absorption line). An analysis of phase dependent spectra shows a significant variation of the centroid of the cyclotron feature during the main pulse. Implications on some theoretical models are discussed. In a slab model the Doppler broadening of an absorption line in a pencil beam configuration gives good agreement with the observations.

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