Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..193l&link_type=abstract
In NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop p 193-200 (SEE N92-21874 12-90)
Astronomy and Astrophysics
Astronomy
5
Eclipsing Binary Stars, Emission Spectra, Light Curve, Pulsars, X Ray Stars, Astronomical Observatories, Daytime, Periodic Variations, Pulse Duration, Spectrum Analysis, Stellar Spectra, X Ray Astronomy
Scientific paper
Hercules X-1 is a well known bright binary X ray pulsator. It has a 1.70 day orbital period, a pulsation period of 1.24 second, and a 35 day semiperiodic variability. The discovery is reported of a new 144 second periodicity in the X ray emission from Her X-1. The periodicity is seen in X ray observations of Her X-1 by the LAC instrument onboard the Ginga satellite during Aug. to Sep. 1988. The periodic flux variations occur during the time of X ray turnon at the beginning of a high state of Her X-1, in the same time that a pre-eclipse dip also occurs. An analysis of the LAC spectra of Her X-1 during this period is also presented. Large changes in spectral shape occur associated with the dip.
Kawai Nobuyuki
Leahy Denis A.
Matsuoka Masaru
Yoshida Akio
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