Einstein Observatory pulse-phase spectroscopy of Hercules X-1

Details Einstein Observatory pulse-phase spectroscopy of Hercules X-1 Einstein Observatory pulse-phase spectroscopy of Hercules X-1

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..301m&link_type=abstract

Astrophysical Journal, Part 1, vol. 262, Nov. 1, 1982, p. 301-307.

Astronomy and Astrophysics

Astronomy

85

Binary Stars, Heao 2, Stellar Spectra, X Ray Astronomy, X Ray Stars, Accretion Disks, Calibrating, Neutron Stars, X Ray Spectra

Scientific paper

Spectra of the Her X-1 pulsations from 0.15 to 4.5 keV have been obtained with the Objective-Grating and Solid State Spectrometers on the HEAO 2 Einstein Observatory. The spectra show no distinct atomic emission or absorption features, except for broad emission near 1 keV possibly due to unresolved Fe L shell emission lines. Spectrally resolved pulse waveforms show a dramatic 240 deg phase shift for E less than 0.85 keV. The soft X-rays are interpreted as the result of the reprocessing of the hard X-ray beam by the inner disk at the magnetospheric boundary of the neutron star, and several spectroscopic and phase observations are suggested which could provide further knowledge of these structures.

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