Surface Chemical Composition, Nuclear Processing, and Deep Mixing: Main Sequence to First Dredge-Up
Abstract
The standard theory of the structure of moderate mass stars predicts that, except for a few light nuclides, the composition of a main sequence star is identical to that of its parental interstellar cloud. Aspects of the depletion of Li in main sequence stars are discussed. Standard theory predicts that the composition of a red giant and its main sequence progenitor must differ because the giant's deep convective envelope brings to the surface material previously exposed to warm protons. Observations of Li, 12C/13C and 16O/17O/18O in giants are related to the predictions for standard models.
- Publication:
-
Challenges to Theories of the Structure of Moderate-Mass Stars
- Pub Date:
- 1991
- DOI:
- 10.1007/3-540-54420-8_82
- Bibcode:
- 1991LNP...388..325L