Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l...5c&link_type=abstract
Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 2, p. L5-L7. Research supported by the Lockheed Independent Research Progra
Astronomy and Astrophysics
Astronomy
42
Binary Stars, Stellar Spectra, X Ray Astronomy, X Ray Stars, Interstellar Extinction, Neutron Stars, Proportional Counters, Radiant Flux Density, Rocket Flight, Spectral Energy Distribution, Stellar Luminosity
Scientific paper
An intense flux of soft X-rays extending up to at least 1 keV has been observed from Her X-1. If the soft X-ray intensity is corrected for interstellar absorption, the luminosity in the 0.16-0.28 keV band is comparable to that from 2 to 10 keV. This confirms the conclusion of Shulman et al. (1975) but extends the detection of this flux to higher energy, a different binary phase, and to a time 19 periods later in the 35-day cycle. These observations suggest that this soft emission may be a stable feature in the spectrum of Her X-1 during its X-ray on state. It appears difficult to account for the high soft X-ray luminosity by current simple models of the X-ray source.
Acton Loren W.
Catura Richard C.
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