Spectroscopic Observations of the Mass Donor Star in SS 433

Abstract

The microquasar SS 433 is an interacting massive binary consisting of an evolved mass donor and a compact companion that ejects relativistic jets. The mass donor was previously identified through spectroscopic observations of absorption lines in the blue part of the spectrum that showed Doppler shifts associated with orbital motion and strength variations related to the orbital modulation of the star-to-disk flux ratio and to disk obscuration. However, subsequent observations revealed other absorption features that lacked these properties and that were probably formed in the disk gas outflow. We present here follow-up observations of SS 433 at orbital and precession phases identical to those from several previous studies with the goals of confirming the detection of the mass donor spectrum and providing more reliable masses for the two system components. We show that the absorption features present as well as those previously observed almost certainly belong to the mass donor star, and we find revised masses of 12.3 +/- 3.3 and 4.3 +/- 0.8 M(sun) for the mass donor and compact object, respectively.

12 pages, 3 figures, submitted to ApJL

References in corpus (3)

• The Distance to SS433/W50 and its Interaction with the ISM
• Deep optical observations of the interaction of the SS 433 microquasar jet with the W 50 radio continuum shell
• Diagnostics of the black hole candidate SS433 with the RXTE

Cited by in corpus (17)

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• Multi-wavelength Emission from Galactic Jets: the Case of the Microquasar SS433
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• Mass ratio in SS433 revisited
• Supernovae Producing Unbound Binaries and Triples
• An optical spectroscopic and polarimetric study of the microquasar binary system SS 433
• Diagnostics of Parameters for the X-ray Jets of SS 433 from High-Resolution Chandra Spectroscopy
• Simulations of the progenitors of black hole-neutron star gravitational wave sources
• Compact Objects in close orbits as Gravitational Wave Sources: Formation Scenarios and Properties
• A Search for Unbound Stellar Companions to Pulsar J1124-5916
• On the Formation of SS433
• Infrared interferometry to spatially and spectrally resolve jets in X-ray binaries
• Simulation-calibrated Bayesian inference for progenitor properties of the microquasar SS 433
• Discovery of CO Clouds Associated with the X-ray Jets of SS 433: Evidence for Shock-Cloud Interaction Enhancing Nonthermal X-ray Emission