On masses of the components in SS433

Abstract

A huge optical luminosity of the supercritical accretion disc and powerful stellar wind in the high-mass X-ray binary SS433 make it difficult to reliably estimate the mass ratio of the binary components from spectroscopic observations. We analyze different indirect methods of the mass ratio estimate. We show that with an account of the possible Roche lobe overflow by the optical star, the analysis of X-ray eclipses in the standard and hard X-ray bands suggests the estimate $q=M_{\mathrm{x}}/M_{\mathrm{v}}\gtrsim 0.3$. We argue that the double-peak hydrogen Brackett lines in SS433 should form not in the accretion disc but in a circumbinary envelope, suggesting a total mass of $M_{\mathrm{v}}+M_{\mathrm{x}}\gtrsim 40M_{\odot }$. The observed long-term stability of the orbital period in SS433 $|{\dot{P}}_b/P_b|\le 1.793\times 10^{-14}$~s${}^{-1}$ over $\sim 28$ year period is used to place an independent constraint of $q\gtrsim 0.6$ in SS433, confirming its being a Galactic microquasar hosting a superaccreting black hole.

arXiv comment6 pages, 3 figures, accepted for publication in MNRAS on July 6, 2018

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Cited by in corpus (18)

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• Discovery of orbital Eccentricity and Evidence for orbital Period Increase of SS433
• SS433: a massive X-ray binary at advanced evolutionary stage
• Ultraluminous X-ray sources with flat-topped noise and QPO
• Mass ratio in SS433 revisited
• Super-Keplerian Equatorial Outflows in SS 433. Centrifugal Ejection of the Circumbinary Disk
• Population synthesis of ultraluminous X-ray sources with magnetised neutron stars
• Diagnostics of Parameters for the X-ray Jets of SS 433 from High-Resolution Chandra Spectroscopy
• Evolutionary Increase of the orbital Separation and Change of the Roche Lobe Size in SS433
• Rapid binary mass transfer: Circumbinary outflows and angular momentum losses
• Galactic population of black holes in detached binaries with low-mass stripped helium stars: the case of LB-1 (LS~V+22~25)
• On the Formation of SS433
• The Black Hole Candidate Swift J1728.9$-$3613 and the Supernova Remnant G351.9$-$0.9
• Mass flows and their behaviors in the SS433--W50 system
• Radiatively Cooled Binary Mass Transfer: Flow Structure, Luminosities, and L2 Outflows Across Mass Transfer Rates
• Constraints on the collimated X-ray emission of SS 433 from the reflection on molecular clouds
• Simulation-calibrated Bayesian inference for progenitor properties of the microquasar SS 433
• Investigation of the Microquasar SS 433 with VERITAS