Coordinated INTEGRAL and optical observations of SS433
A. M. Cherepashchuk, R. A. Sunyaev, S. N. Fabrika, S. V. Molkov, E. A. Barsukova, E. A. Antokhina, T. R. Irsmambetova, I. E. Panchenko, K. A. Postnov, E. V. Seifina, N. I. Shakura, A. N. Timokhin, I. F. Bikmaev, N. A. Sakhibullin, Yu. N. Gnedin, A. A. Arkharov, V. M. Larionov
Abstract
Results of simultaneous INTEGRAL and optical observations of galactic microquasar SS433 in May 2003 are presented. The analysis of the X-ray and optical eclipse duration and hard X-ray spectra obtained by INTEGRAL together with optical spectroscopy obtained on the 6-m telescope allows us to construct a model of SS433 as a massive X-ray binary. X-ray eclipse in hard X-rays has a depth of 80% and extended wings. The optical spectroscopy allows us to identify the optical companion as a A5-A7 supergiant and to measure its radial velocity semi-amplitude Kv=132 km/s. A strong heating effect in the optical star atmosphere is discovered spectroscopically. The observed broadband X-ray spectrum 2-100 keV can be described by emission from optically thin thermal plasma with kT 15-20 keV
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