SS433: the second known Wolf-Rayet X-ray binary after Cygnus X-3

Astronomy and Astrophysics – Astrophysics

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We present mid-IR spectrophotometric observations of SS433 with ISOPHOT at four different orbital phases in 1996 and 1997. The HeI+HeII lines in both spectra of SS433 and the Wolf-Rayet star WR147, a wind-colliding WN8+BO5 binary system, closely match. The 2.5-12 micron continuum radiation is due to an expanding wind free-free emission in an intermediate case between optically thick and optically thin regime. A rough mass loss rate evaluation gives about 1.4 10**{-4} M-sun/yr. Results are consistent with a Wolf-Rayet-like companion to the compact object in SS433. A similar study for Cygnus X-3, also observed with ISOPHOT, confirms the Wolf-Rayet like nature of its companion, although with a later WN type than previously suggested.

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