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SS 433: a WR X-ray binary or a WR-type phenomenon ?

Yael Fuchs·L. Koch Miramond·P. Abraham
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Abstract

We present mid-infrared spectra of the microquasar SS 433 obtained with the Infrared Space Observatory (spectroscopic mode of ISOPHOT) and compare them to the spectra of four Wolf-Rayet stars. The mid-infrared spectrum of SS 433 shows mainly HI and HeI emission lines and is very similar to the spectrum of WR 147, a WN8(h)+B0.5V binary with a colliding wind. The 2-12 micron continuum emission corresponds to optically thin and partially optically thick free-free emission from which we calculate a mass loss rate of 1.4-2.2x10^{-4} M_sun/yr if the wind is homogeneous and a third of these values if it is clumped, which is consistent with a strong WN stellar wind. We propose that this strong wind outflows from a geometrically thick envelope of material surrounding the compact object like a stellar atmosphere, imitating the Wolf-Rayet phenomenon.

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Yael Fuchs, L. Koch Miramond, P. Abraham. 2004-10-20. SS 433: a WR X-ray binary or a WR-type phenomenon ?. https://arxiv.org/abs/astro-ph/0410480

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