13-17 June 2016
Niigata University (Ikarashi Campus)
Asia/Tokyo timezone

Insights on the first stars from CEMP-no stars

15 Jun 2016, 15:30
Library Hall, Central Library (Niigata University (Ikarashi Campus))

Library Hall, Central Library

Niigata University (Ikarashi Campus)

Central Library, Niigata University (Ikarashi Campus), 8050 Ikarashi 2-nocho, Nishi-ku Niigata City, 950-2181, Japan
Short Talk Students2


Mr Arthur Choplin (Geneva Observatory)


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)


Prof. Georges Meynet (Geneva Observatory) Dr Sylvia Ekstrom (Geneva Observatory)

Presentation Materials