Mass ratio in SS433 revisited

Abstract

We revisit the determination of binary mass ratio in the Galactic microquasar SS433 based on recent GRAVITY VLTI measurements of mass and angular momentum outflow through a circumbinary disc. The new observations combined with the constancy of the binary orbital period over $\sim 30$ yrs confirm that the mass ratio in SS433 is $q=M_{\mathrm{x}}/M_{\mathrm{v}}\gtrsim 0.6$. For the assumed optical star mass $M_{\mathrm{v}}$ ranging from $\sim 8$ to 15 $M_{\odot }$ such a mass ratio suggests a low limit of the compact object mass of $M_{\mathrm{x}}\sim 5-9M_{\odot }$, placing the compact object in SS433 as a stellar-mass black hole.

4 pages, 3 figures, accepted in MNRAS, Main Journal

References in corpus (2)

• Mass Transfer from Giant Donors
• Spectroscopic Observations of the Mass Donor Star in SS 433

Cited by in corpus (7)

• Ultraluminous X-Ray Sources
• Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433
• Discovery of orbital Eccentricity and Evidence for orbital Period Increase of SS433
• Multi-wavelength Emission from Galactic Jets: the Case of the Microquasar SS433
• Criteria for Dynamical Timescale Mass Transfer of Metal-poor Intermediate-mass Stars
• Evolutionary Increase of the orbital Separation and Change of the Roche Lobe Size in SS433
• On the Formation of SS433