HEAO-1 observations of HER X-1 at energies above 13 keV

Details HEAO-1 observations of HER X-1 at energies above 13 keV HEAO-1 observations of HER X-1 at energies above 13 keV

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978grsa.rept..386m&link_type=abstract

In NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys. p 386-393 (SEE N78-31971 22-88)

Astronomy and Astrophysics

Astrophysics

4

Astronomical Spectroscopy, Emission Spectra, Flux Density, Heao, Hercules Nova, X Ray Sources, Continuous Spectra, Cyclotron Resonance, Neutron Stars, Pulsed Radiation

Scientific paper

Results from preliminary analysis of HEAO-1 pointing observations of Her X-1 on three days in February 1978 are presented. Pulsed flux is detected up to approximately 70 keV with a clear indication of emission at approximately 60 deV which is above the continuum spectrum extrapolated from lower energies. If this excess emission is interpreted as a spectral line, its intensity varies from (1.2 plus or minus 0.2) x (10 to the minus 3 power) to (0.2 plus or minus 0.2) x (10 to the minus 3 power) ph/sq cm-sec with a time scale of one day. A factor 2 decrease in the low energy continuum is associated with the decrease in the excess emission.

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