We present the results of binary population simulations of carbon-enhanced metal-poor (CEMP) stars. We show that nitrogen and fluorine are useful tracers of the origin of CEMP stars, and conclude that the observed paucity of very nitrogen-rich stars puts strong constraints on possible modifications of the initial mass function at low metallicity. The large number fraction of CEMP stars may instead require much more efficient dredge-up from low-metallicity asymptotic giant branch stars.
@article{arxiv.0808.2722,
title = {Modelling the evolution and nucleosynthesis of carbon-enhanced metal-poor stars},
author = {O. R. Pols and R. G. Izzard and M. Lugaro and S. E. de Mink},
journal= {arXiv preprint arXiv:0808.2722},
year = {2009}
}
Comments
6 pages, 1 figure, to appear in the proceedings of IAU Symposium 252 "The Art of Modelling Stars in the 21st Century", April 6-11, 2008, Sanya, China