Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-11
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures. Shortened version of the paper to be published in: "Proceedings of the 4th Microquasar Workshop", 2002, ed
Scientific paper
Mean orbital light curves of SS433 in different precessional phases are analysed for active and passive states separately. In passive states the mean brightness depends strongly on the disk orientation, the star is fainter by a factor about 2.2 in the disk edge-on positions. In active states the brightness does not depend significantly on the precessional phase. We suggest that in active states hot gas cocoons surrounding the inner jets grow and can not be shielded by the disk rim in the edge-on phases. Brightest optical flares are clear separated in two groups in orbital phases, it is considered as indication of orbital eccentricity. Bright flares prefer specific precession and nodding phases, it favours the slaved disk model and the flares as disk perturbations by a torque applied to outer parts of the accretion disk.
Fabrika Sergei
Irsmambetova Tatyana
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