An alternative to common envelope evolution

Details An alternative to common envelope evolution An alternative to common envelope evolution

2006-12-10

arxiv.org/abs/astro-ph/0612251v1

Mon.Not.Roy.Astron.Soc.375:1000-1008,2007

Astronomy and Astrophysics

Astrophysics

MNRAS accepted

Scientific paper

10.1111/j.1365-2966.2006.11386.x

We investigate the evolution of interacting binaries where the donor star is a low-mass giant more massive than its companion. It is usual to assume that such systems undergo common-envelope (CE) evolution, where the orbital energy is used to eject the donor envelope, thus producing a closer binary or a merger. We suggest instead that because mass transfer is super-Eddington even for non-compact companions, a wide range of systems avoid this type of CE phase. The accretion energy released in the rapid mass transfer phase unbinds a significant fraction of the giant's envelope, reducing the tendency to dynamical instability and merging. We show that our physical picture accounts for the success of empirical parametrizations of the outcomes of assumed CE phases.

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