Meridional circulation and CNO anomalies in red giant stars

Abstract

view Abstract Citations (426) References (90) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Meridional circulation and CNO anomalies in red giant stars. Sweigart, A. V. ; Mengel, J. G. Abstract 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. Publication: The Astrophysical Journal Pub Date: April 1979 DOI: 10.1086/156996 Bibcode: 1979ApJ...229..624S Keywords: Carbon Stars; Meridional Flow; Red Giant Stars; Stellar Rotation; Astrophysics; Nitrogen; Oxygen; Stellar Envelopes; Stellar Interiors; Astrophysics; CNO:Red Giants; Red Giants:Element Abundances; Red Giants:Models; Red Giants:Rotation full text sources ADS | data products SIMBAD (3)