Journal
ASTROPHYSICAL JOURNAL
Volume 578, Issue 1, Pages L67-L70Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/344436
Keywords
stars : early-type; stars : individual (SS 433, V1343 Aquilae); X-rays : binaries
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We present results from a short series of blue, moderate-resolution spectra of the microquasar binary SS 433. The observations were made at a time optimized to find the spectrum of the donor star, i.e., when the donor was in the foreground and well above the plane of the obscuring disk. In addition to the well-known stationary and jet emission lines, we find evidence of a weak absorption spectrum that resembles that of an A-type evolved star. These lines display radial velocity shifts opposite to those associated with the disk surrounding the compact star, and they appear strongest when the disk is maximally eclipsed. All these properties suggest that these absorption lines form in the atmosphere of the hitherto unseen mass donor star in SS 433. The radial velocity shifts observed are consistent with a mass ratio M-X/M-O = 0.57 +/- 0.11 and masses of M-O = 19 +/- 7 M. and M-X = 11 +/- 5 M.. These results indicate that the system consists of an evolved, massive donor and a black hole mass gainer.
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