Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..990p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 990-1000.
Astronomy and Astrophysics
Astrophysics
15
Red Giant Stars, Stellar Composition, Stellar Envelopes, Stellar Evolution, Stellar Mass Accretion, Abundance, Asymptotic Giant Branch Stars, Hot Stars, Stellar Mass
Scientific paper
The stability of composition inversions in stellar envelopes is studied. An expression is derived for how steep an inversion can be before the onset of instability to large-scale motions. It is shown that, even if the gradient of the inversion is sufficiently small to be stable against such large-scale motions, it should generate small-scale turbulent motions. The size of such small-scale motions and the rate at which they are expected to destroy the inverted composition gradient are estimated, and the estimates are applied to a model of a one solar mass star accreting material from a red giant envelope that has been partially processed by CN cycling and p-p reactions. It is shown that the composition inversion in this case can be eliminated in a time that is shorter than the evolutionary time scale of the star, and it is shown how the resultant mixing can affect the observed surface abundances.
No associations
LandOfFree
Stability and mixing of composition inversions in stellar envelopes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Stability and mixing of composition inversions in stellar envelopes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stability and mixing of composition inversions in stellar envelopes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1801622