Clues about the first stars from CEMP-no stars
Abstract
The material used to form the CEMP-no stars presents signatures of material processed by the CNO cycle and by He-burning from a previous stellar generation called the source stars. In order to reproduce the relative abundance ratios like for instance C/N or ^{12}C/^{13}C, some mixing between the two burning regions must have occured in the source stars and only the outer layers of the stars, with modest amount coming from the CO core, must have been expelled either through stellar winds or at the time of the (faint) supernova event. With new models at low metallicity including rotational mixing, we shall discuss how the variety of abundances observed for CEMP-no stars can be reproduced.
- Publication:
-
SF2A-2015: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
- Pub Date:
- December 2015
- DOI:
- 10.48550/arXiv.1509.04446
- arXiv:
- arXiv:1509.04446
- Bibcode:
- 2015sf2a.conf..355C
- Keywords:
-
- stars: evolution;
- rotation;
- massive;
- abundances;
- nucleosynthesis;
- chemically peculiar;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 4 pages, 1 figure, sf2a conference