First Dredge-Up and further Mixing Mechanisms along the Red Giant Branch in Field Stars

Details First Dredge-Up and further Mixing Mechanisms along the Red Giant Branch in Field Stars First Dredge-Up and further Mixing Mechanisms along the Red Giant Branch in Field Stars

1998-12-04

arxiv.org/abs/astro-ph/9812095v1

Astrophys.Space Sci. 265 (1999) 189-190

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, LaTex, uses crckapb.sty, poster paper to appear in the proceedings of the meeting "Galaxy Evolution: Connec

Scientific paper

10.1023/A:1002103408744

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.

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