%0 Journal Article
%T First Dredge-Up and further Mixing Mechanisms along the Red Giant Branch in Field Stars
%A Eugenio Carretta
%A Raffaele Gratton
%A Chris Sneden
%A Angela Bragaglia
%J Physics
%D 1998
%I arXiv
%R 10.1023/A:1002103408744
%X In this research we use a large sample of field metal-poor stars ([Fe/H]<-1) in different evolutionary phases to prove observationally that (small mass) subgiants (stars brighter than the first dredge-up and fainter than the RGB bump) have abundances of light elements in agreement with predictions from classical evolutionary models. A further mixing episode occurs just after the RGB bump, in agreement with the predictions by Charbonnel (1994, A&A, 282, 811; 1995, ApJ, 453, L41) The O-Na anti-correlation, typical signature observed amongst globular cluster giants, is not present amongst field stars.
%U http://arxiv.org/abs/astro-ph/9812095v1