Meridional circulation and CNO anomalies in red giant stars

Details Meridional circulation and CNO anomalies in red giant stars Meridional circulation and CNO anomalies in red giant stars

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..624s&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, Apr. 15, 1979, p. 624-641.

Astronomy and Astrophysics

Astrophysics

354

Carbon Stars, Meridional Flow, Red Giant Stars, Stellar Rotation, Astrophysics, Nitrogen, Oxygen, Stellar Envelopes, Stellar Interiors

Scientific paper

The possibility is investigated that meridional circulation driven by internal rotation might lead to the mixing of CNO-processed material from the vicinity of the hydrogen shell into the envelope of a red giant star. This theory of meridional mixing is found to be generally consistent with available data and to be capable of explaining a number of observational results without invoking a radical departure from the standard physics of stellar interiors. It is suggested that meridional circulation must be a normal characteristic of a rotating star and that meridional mixing provides a reasonable framework for understanding many of the CNO anomalies exhibited by weak-G-band and CN-strong stars as well as the low C-12/C-13 ratios measured among field red giants.

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