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The Puzzling Frequencies of CEMP and NEMP Stars

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arxiv 0910.1489 v1 pith:LG7LWLFV submitted 2009-10-08 astro-ph.SR astro-ph.GA

classification astro-ph.SRastro-ph.GA
keywords starscempnempbinarycarbon-constraintsfrequenciesfunction
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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.

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