Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-03
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, to appear in "Compact binaries in the Galaxy and beyond"
Scientific paper
SS433 is the prototype microquasar in the Galaxy and may even be analogous to the ULX sources if the jets' kinetic energy is taken into account. However, in spite of 20 years of study, our constraints on the nature of the binary system are extremely limited as a result of the difficulty of locating spectral features that can reveal the nature and motion of the mass donor. Newly acquired, high resolution blue spectra taken when the (precessing) disc is edge-on suggest that the binary is close to a common-envelope phase, and hence providing kinematic constraints is extremely difficult. Nevertheless, we do find evidence for a massive donor, as expected for the inferred very high mass transfer rate, and we compare SS433's properties with those of Cyg X-3.
Barnes A. D.
Casares Jorge
Charles Phil A.
Clark Simon J.
Clarkson William I.
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