The Puzzling Frequencies of CEMP and NEMP Stars

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Contents Vol 26(3)

doi:10.1071/AS08076

The Puzzling Frequencies of CEMP and NEMP Stars

O. R. Pols ^A ^E, R. G. Izzard ^A ^B, E. Glebbeek ^C, R. J. Stancliffe ^D

^A Sterrekundig Instituut Utrecht, P.O. Box 80 000, NL-3584 TA Utrecht, The Netherlands
^B Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP226, Boulevard du Triomphe, B–1050 Bruxelles, Belgium
^C Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
^D Centre for Stellar and Planetary Astrophysics, Monash University, P.O. Box 28M, Clayton, VIC 3800, Australia
^E Corresponding author. Email: o.r.pols@uu.nl





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Publications of the Astronomical Society of Australia 26(3) 327–329 http://dx.doi.org/10.1071/AS08076
Submitted: 23 December 2008 Accepted: 9 April 2009 Published online: 18 September 2009

Abstract

We present the results of binary population simulations of carbon- and nitrogen-enhanced metal-poor (CEMP and NEMP) stars. We show that the observed paucity of very nitrogen-rich stars puts strong constraints on possible modifications of the initial mass function at low metallicity.

Keywords: stars: AGB and post-AGB — stars: abundances — stars: binaries — stars : evolution — stars: mass function