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1999ApJ...510..232B - Astrophys. J., 510, 232-250 (1999/January-1)
The CNO isotopes: deep circulation in red giants and first and second dredge-up.
BOOTHROYD A.I. and SACKMANN I.-J.
Abstract (from CDS):
CBP increases dramatically as one reduces the stellar mass or metallicity–roughly as M–2 on the RGB, because of the longer RGB of low-mass stars, and roughly as Z–1, because of the higher H-shell burning temperatures of low-metallicity stars. In low-mass Population II stars, all the CNO isotopes are expected to be significantly altered by CBP. Field Population II stars exhibit RGB abundances consistent with the predictions of our CBP models that have been normalized to reproduce the Population I RGB abundances. On the other hand, globular cluster stars are observed to encounter much more extensive processing; additionally, CBP is observed to start near the base of the globular cluster RGB (overcoming any ``µ-barrier''). For the CNO isotopes 12C, 13C, 14N, 16O, 17O, and 18O, we also present self-consistent calculations of the consequences of both first and second dredge-up, i.e., of standard convection during the RGB and AGB stages, over a wide range of stellar masses (0.8-9 M☉) and metallicities (Z=0.02-0.0001). We demonstrate that the common low- and intermediate-mass stars are a prime source of 13C, 14N, and 17O in the universe. The light elements (3He, 4He, 7Li, 9Be, 10B, and 11B) are discussed in a companion paper.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Abundances - Nuclear Reactions, Nucleosynthesis, Abundances - stars:abundances - Stars: AGB and Post-AGB
Simbad objects: 14
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