Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..153d&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Globular Clusters, Element Abundances, Agb Stars
Scientific paper
Recent observations of star-to-star chemical abundance variations well below the bump luminosity in globular clusters are not easily explained by evolutionary processes and thus favor the primordial scenario. So far massive AGB stars have been considered as the most likely sources of primordial abundance variations. I will present some arguments against this hypothesis and I will propose that such variations originate in RGB and/or AGB stars which are just a bit more massive than the present-day main-sequence (MS) turnoff stars and which had previously experienced enhanced extra-mixing. In this case the preferred way of polluting the lower-mass MS stars by nuclearly processed material would be mass transfer in binaries rather than the accretion of stellar wind material ejected from single stars.
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