Adiabatic Mass Loss and the Outcome of the Common Envelope Phase of Binary Evolution - Astrophysics > Solar and Stellar AstrophysicsReportar como inadecuado




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Abstract: We have developed a new method for calculating common envelope CE eventsbased on explicit consideration of the donor star-s structural response toadiabatic mass loss. In contrast to existing CE prescriptions, which specify apriori the donor-s remnant mass, we determine this quantity self-consistentlyand find it depends on binary and CE parameters. This aspect of our model isparticularly important to realistic modeling for upper main sequence stardonors without strongly degenerate cores and hence without a clearcore-envelope boundary. We illustrate the central features of our method byconsidering CE events involving 10 solar mass donors on or before their redgiant branch. For such donors, the remnant core mass can be as much as 30%larger than the star-s He-core mass. Applied across a population of suchbinaries, our methodology results in a significantly broader remnant mass andfinal orbital separation distribution and a 20% increase in CE survival ratesas compared to previous prescriptions for the CE phase.



Autor: Christopher J. Deloye, Ronald E. Taam

Fuente: https://arxiv.org/







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