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
10m
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

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)

Presentation Materials