Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..336g&link_type=abstract
Astronomy Reports, Volume 42, Issue 3, May 1998, pp.336-345
Astronomy and Astrophysics
Astronomy
9
Scientific paper
Multi-color photometric observations of SS433 carried out in the WBVR system at the Tian-Shan Observatory are presented. Color variations with the precession and orbital periods accompanied by reddening of the star are confirmed for both the primary and secondary eclipse minima, and also during the minimum in the precession period in V-R. These color variations are interpreted as the result of variable `third light' with a color index redder than that of the eclipsing binary system. Two types of brightness flares are detected, in which an excess in the red R filter does or does not appear. The observations in the V and R filters establish that the emission of SS433 consists of two components whose V-R color indices are 19 and 28. These components change nearly independently of each other. The light curve of each component can be separated out from the total brightness and studied separately. The known periodic brightness variations with the orbital, precession, and nutation periods can be seen in the blue component. The red component shows slow, irregular variations from season to season with amplitudes to 1m, flares, and deep short-time scale minima. Flares of the red com-ponent correlate with radio flares, and lead them by several hours.
Cherepashchuk Anatol M.
Esipov Valentine F.
Goranskii V. P.
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