Common Envelope Binaries and Mass Loss

  • A. Delgado
Part of the International Astronomical Union/Union Astronomique Internationale book series (IAUS, volume 83)


In this work we calculate the evolution of a binary system with a common envelope, which consists of a blue supergiant and a neutron star. We consider as a free parameter the effectivity with which the energy liberated at the orbit produces mass loss from the system.

The evolutionary calculations were made, using various values of this parameter, for a system with mass ratio 25:1. As initial state we choose a model in the phase of Hydrogen-shell burning, before and after the begin of Helium-burning in the core.

We found that, under certain conditions, it is possible for the radius of the orbit and the period of the system to increase; the time scale for the “spiral-in” would be of the order of 104–105 years. Mass loss rates are between 10−3 M/y and 10−4 M/y.


Neutron Star Mass Loss Rate Mass Accretion Rate Common Envelope Helium Star 
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Copyright information

© International Astronomical Union 1979

Authors and Affiliations

  • A. Delgado
    • 1
  1. 1.MPI für Physik und Astrophysik8 München 40Germany

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