Coordinated INTEGRAL and optical observations of SS433
/ Authors
A. Cherepashchuk, R. Sunyaev, S. Fabrika, S. Molkov, E. Barsukova, E. Antokhina, T. Irsmambetova, I. Panchenko, K. Postnov, E. Seifina
and 7 more authors
N. Shakura, A. Timokhin, I. Bikmaev, N. Sakhibullin, Y. Gnedin, A. Arkharov, V. Larionov
/ Abstract
Results of simultaneous {\it 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 {\it 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 $\sim 80%$ 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 $K_v=132$ 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 $kT\sim 15-20 keV$
Journal: arXiv: Astrophysics