Spectral behavior of Hercules X-1 - Its long-term variability and pulse phase spectroscopy

Details Spectral behavior of Hercules X-1 - Its long-term variability and pulse phase spectroscopy Spectral behavior of Hercules X-1 - Its long-term variability and pulse phase spectroscopy

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..641s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. 641-646.

Other

50

Neutron Stars, Spectrum Analysis, Stellar Spectra, Variable Stars, X Ray Binaries, Cyclotron Radiation, Heao 1, Line Spectra, Stellar Magnetic Fields

Scientific paper

Results are presented of the analysis of the broad-energy-band Her X-1 spectra obtained by HEAO 1. Data from 13 pointed observations covered three 35-day cycles in February, August, and September of 1978. The pulse phase-averaged spectrum did not show any apparent variation during the main-on state, except for the overall intensity. The pulse phase-resolved spectrum, on the other hand, showed a moderately strong phase dependence in each of the main-on state pointings. This may imply that the orientation of the emission region is not changing on a monthly time frame, but the geometry of that region may evolve with time.

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