Nitrogen depletion in field red giants: mixing during the He flash?
نویسندگان
چکیده
منابع مشابه
Compulsory Deep Mixing of He and CNO Isotopes in the Envelopes of low-mass Red Giants
Three-dimensional stellar modeling has enabled us to identify a deep-mixing mechanism that must operate in all low mass giants. This mixing process is not optional, and is driven by a molecular weight inversion created by the He(He,2p)He reaction. In this paper we characterize the behavior of this mixing, and study its impact on the envelope abundances. It not only eliminates the problem of He ...
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We present the results of an observational study of the efficiency of deep mixing in globular cluster red giants as a function of stellar metallicity. We determine [C/Fe] abundances based on low-resolution spectra taken with the Kast spectrograph on the 3m Shane telescope at Lick Observatory. Spectra centered on the 4300Å CH absorption band were taken for 42 bright red giants in 11 Galactic glo...
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Evolution and surface abundances of red giants experiencing deep mixing
We have calculated the evolution of low metallicity red giant stars under the assumption of deep mixing between the convective envelope and the hydrogen burning shell. We find that the extent of the observed abundance anomalies, and in particular the universal O-Na anticorrelation, can be totally explained by mixing which does not lead to significant helium enrichment of the envelope. On the ot...
متن کاملThe depletion of carbon by extra mixing in metal-poor giants
There is an apparent dichotomy between the metal-poor ([Fe/H] 6 −2) yet carbonnormal giants and their carbon-rich counterparts. The former undergo significant depletion of carbon on the red giant branch after they have undergone first dredge-up, whereas the latter do not appear to experience significant depletion. We investigate this in the context that the extra mixing occurs via the thermohal...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2016
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stw2632