Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..263k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. 263-268.
Astronomy and Astrophysics
Astronomy
38
Ginga Satellite, Spaceborne Astronomy, Stellar Mass Ejection, X Ray Binaries, Astronomical Spectroscopy, Radio Jets (Astronomy), X Ray Astronomy
Scientific paper
Results of time-variation analyses in the X-rays from Cyg X-3 observed with the large-area counters on board Ginga are presented. No significant modulation near 12 ms was detected. The upper limit of the amplitude in the range 10-256 Hz, assuming sinusoidal modulation and taking account of the orbital motion of the X-ray star, is 0.78 percent of the mean intensity. Aperiodic variation shorter than about 1 Hz was not detected either, but variation longer than 0.1 Hz was observed. Cross spectral analysis shows frequency-independent time lags of the soft X-ray variation. It is concluded that the X-ray-emitting region is surrounded by cold scattering matter with R-tau(tau is greater than 1) or R(tau is less than 1) = (3-30) x 10 exp 11 cm, where R and tau are the radius and the Thomson scattering optical depth, respectively. R less than 4.8 x 10 exp 11 is obtained from a diplike structure observed in the light curve. The time variation during the X-ray-intense phase was greater than that during the X-ray-faint phase, which supports the stellar wind model's capacity to explain the almost sinusoidal X-ray light curve.
Kitamoto Shunji
Mizobuchi Seiko
Nakamura Hiroshi
Yamashita Koujun
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