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- W1972807730 abstract "It is demonstrated that deep circulation mixing below the base of the standard convective envelope, and the consequent cool bottom processing (CBP) of the CNO isotopes, can reproduce the trend with stellar mass of the 12C/13C observations in low-mass red giants. (This trend is opposite to what is expected from standard first dredge-up.) Our models assume that extra mixing always reaches to the same distance in temperature from the H-burning shell and that CBP begins when the H-burning shell erases the molecular weight discontinuity (μ-barrier) established by first dredge-up. For Population I stars, none of the other CNO isotopes except 15N are expected to be altered by CBP. (If 18O depletion occurs on the asymptotic giant branch [AGB], as some observations suggest, it would require that extra mixing reach closer to the H-burning shell on the AGB than on the red giant branch [RGB]—and should also result in a much lower 12C/13C ratio than is observed in the relevant AGB stars.)" @default.
- W1972807730 created "2016-06-24" @default.
- W1972807730 creator A5033022954 @default.
- W1972807730 creator A5081576182 @default.
- W1972807730 date "1999-01-01" @default.
- W1972807730 modified "2023-10-05" @default.
- W1972807730 title "The CNO Isotopes: Deep Circulation in Red Giants and First and Second Dredge‐up" @default.
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- W1972807730 doi "https://doi.org/10.1086/306546" @default.
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