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Energy and Angular Momentum Deposition During Common Envelope Evolution

Published online by Cambridge University Press:  22 February 2018

Noam Soker
Noam Soker*
Affiliation:
Department of Physics, Technion Israel Institute of Technology, Israel Department of Physics, Oranim, Israel

Abstract

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I consider three processes which enhance mass loss rate from a common envelope of a giant star with a main sequence or a white dwarf companion spiraling-in inside its envelope. I consider deposition of orbital energy and orbital angular momentum to the giant's envelope, and the formation of jets by an accreting companion and their propagation in the envelope. I find that in many cases the deposition of orbital angular momentum to the envelope may be more important to the mass loss process than the deposition of orbital energy. Jets blown by an accreting companion, in particular a white dwarf, orbiting inside the outer regions of the giant's envelope may also dominate over orbital energy deposition at early stage of the common envelope evolution. These imply that, studies which ignore the deposition of angular momentum to the envelope and the effects of the accreting companion may reach wrong conclusions.

Resumen

Resumen

Tomo en consideración ties procesos que incrementan la tasa de pérdida de masa de la envolvente común de una gigante do la secuencia principal о de una compañera enana blanca que se precipita en espiral dentro de su envolvente. Considero el depósito de energia orbital y momento angular orbital en la envolvente de la gigante la fonnación de “jets” por la compañera acrecicnte que se propagan dentro de la envolvente. Encuentro que et muchos casos el depósito del momento angular en la envolvente puede ser más importante para el proceso de pérdida de masa que el depósito de energía orbital. En etapas tempranas de la evolución común de la envolvente los “jets” que son expulsados por una compañnera acreciente, en particular una enana blanca que orbita denti do las regiones exteriores de la envolvente do la gigante, también pueden dominar sobre el depósito de energía Esto implica que los estudios que ignoran el depósito del momento angular dentro de la envolvente y los efectos de la compañera acrecicnte pueden llegar a conclusiones erróneas.

Keywords

ISMJets and Outflows — StarsAGB and POST-AGB — StarsBinaries — StarsEvolution — StarsMass Loss
Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 30 - 32
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

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