Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..453k&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 453-458 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
3
Eclipses, Ginga Satellite, Satellite Observation, Stellar Spectra, Supernova Remnants, X Ray Binaries, X Ray Spectra, Black Holes (Astronomy), Compton Effect, Japanese Space Program, Precession
Scientific paper
The X-ray eclipses of SS433 were observed by Ginga on three occasions in May of 1987, 1988 and 1989. It was found that: the X-ray eclipse is always partial, and it occurs at a phase in good agreement with optical minimum; there is a small jitter in the binary phase of the X-ray ingress and egress; the X-ray flux as well as its eclipse fraction changes depending on the precession phase; the X-ray flux was low and the eclipse was shallow at the observations in 1988 and 1989 when the angle between the jets and the line of sight is close to 90 degrees; the intrinsic width of the intense emission line at approximately 7 keV is large, and changes with the jet precession phase; the emission line consists of at least two components with small and large width. The presence of Compton scattering medium is suggested.
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