Stellar structure and mass loss on the upper asymptotic giant branch

Noam Soker*, Amos Harpaz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We examine the envelope properties of asymptotic giant branch (AGB) stars as they evolve on the upper AGB and during the early post-AGB phase. Because of the high mass-loss rate, the envelope mass decreases by more than an order of magnitude. This makes the density profile below the photosphere much shallower, and the entropy profile much steeper. We discuss the possible role of these changes in the profiles in the onset of the high mass-loss rate (superwind) and the large deviation from spherical mass loss at the termination of the AGB. We concentrate on the idea that the shallower density profile and steeper entropy profile allow the formation of cool magnetic spots, above which dust forms much more easily.

Original languageEnglish
Pages (from-to)1158-1164
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume310
Issue number4
DOIs
StatePublished - 21 Dec 1999
Externally publishedYes

Keywords

  • Circumstellar matter
  • Planetary nebulae: general
  • Stars: AGB and post-AGB
  • Stars: magnetic fields
  • Stars: mass-loss

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