Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..449s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 3, June 1, 1992, p. 449-456.
Astronomy and Astrophysics
Astronomy
41
Carbon, Giant Stars, Globular Clusters, Stellar Composition, Stellar Evolution, Stellar Interiors, Cyanogen, Star Clusters, Stellar Models
Scientific paper
An analytic yet approximate analysis of the production of surface carbon depletions among globular cluster giants by interior mixing is presented. It is found that the carbon abundance gradient of 0.25 dex/mag observed on the giant branch of the cluster M92 by Carbon et al. (1982) can be accounted for if circulation currents having speeds of about 0.01 cm/s within the M92 giants are cycling material from the convective envelope down into the proximity of the hydrogen-burning shell, where it is processed and subsequently returned to the envelope. Giant branch mixing may be capable of producing significant modifications from the initial C and N abundance distribution of cluster stars. In order to account for the existence of CN-strong stars on the upper giant branches of globular clusters, it may be necessary to infer that the atmospheres of such stars have undergone substantial O - N processing.
Smith Graeme H.
Tout Christopher A.
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