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The Evolutionary Status of SS 433.

King, Taam, Begelman

    The Astrophysical Journal
    |January 21, 2000
    PubMed
    Summary
    This summary is machine-generated.

    Common envelope evolution in SS 433 is avoided when radiation pressure expels super-Eddington accretion flows. This suggests mass transfer rates far exceed jet mass-loss rates, explaining observed luminosities.

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    Area of Science:

    • Astrophysics
    • Stellar Evolution
    • Accretion Physics

    Background:

    • SS 433 is a unique microquasar exhibiting precessing jets and strong emission lines.
    • Understanding its evolutionary path is crucial for comprehending accretion processes in binary systems.

    Purpose of the Study:

    • To investigate potential evolutionary models for the binary system SS 433.
    • To determine the conditions under which common envelope evolution is avoided.

    Main Methods:

    • Modeling accretion flows and radiation pressure effects.
    • Analyzing mass transfer rates and mass ratios (q).
    • Comparing mass transfer rates with jet mass-loss rates.

    Main Results:

    • Common envelope evolution is avoided if radiation pressure expels super-Eddington accretion flows from the Roche lobe.

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  • This scenario is viable for radiative donors with masses between 4-12 M☉.
  • Mass transfer rates (Ṁtr) are significantly larger than jet mass-loss rates (Ṁjet), explaining the stationary Hα line and infrared luminosity, and low X-ray luminosity.

    • Conclusions:

    • The models favor black hole accretors for donors > 5 M☉ due to moderate mass ratios.
    • For lower mass donors, both neutron star and black hole accretors are possible.
    • The expelled mass explains SS 433's observed spectral and luminosity characteristics.