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Criticism of recent calculations of common envelope ejection

By Noam Soker and Amos Harpaz


We re-examine a recent claim by Han et al. (2002) that the ionization energy in the envelope has to be included in the ejection criterion of common envelopes. In particular, we argue that (1) they do not include an appropriate mass loss rate prior to the onset of the common envelope, i.e., their mass loss rate is much too low; (2) They do not include the energy radiated by the accreting white dwarf companion, as well as that emitted by the core of the giant star; and (3) As argued by one of us before, the opacity in the envelope is too low for the efficient usage of the ionization energy

Year: 2002
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