Speaker
Mr
Arthur Choplin
(Geneva Observatory)
Description
The CEMP-no stars (Carbon-Enhanced Metal-poor stars with no sign or weak signs for the presence of s- or r-elements) are long-lived small mass stars presenting a very low iron content and overabundances of carbon. Their chemically peculiar abundance pattern could be inherited from a previous massive star (the source star) that has lost mass through winds or at the time of the supernova. Because of the rotational mixing at work in a rotating source star, the chemicals species can be mixed efficiently between the different burning regions (e.g. H- and He-burning). It leads to a varied and rich nucleosynthesis. Such an internal mixing tends also to boosts the weak s-process. The observed abundances of the CEMP-no stars can give interesting clues on the behavior (rotation, nucleosynthesis...) of their progenitor.
Primary author
Mr
Arthur Choplin
(Geneva Observatory)
Co-authors
Prof.
Georges Meynet
(Geneva Observatory)
Dr
Sylvia Ekstrom
(Geneva Observatory)
