Coordinated INTEGRAL and optical observations of SS433

Details Coordinated INTEGRAL and optical observations of SS433 Coordinated INTEGRAL and optical observations of SS433

2004-04-24

arxiv.org/abs/astro-ph/0404479v1

Astronomy and Astrophysics

Astrophysics

8 pages, 11 figures, Proceedings of the V INTEGRAL Workshop, Munich 16-20 February 2004. ESA SP-552

Scientific paper

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 $kT\sim 15-20 keV$

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