Binary Populations of Carbon-Enhanced Metal-Poor Stars

2); (2) Sterrenkundig Instituut; 3); (3) Department of Physics; (4) School of Mathematical Sciences; 5); (5) Institute of Astronomy; Astronomy; Evert Glebbeek (2; McMaster University

arxiv: 0909.4891 · v1 · pith:4ZKN4NPSnew · submitted 2009-09-26 · 🌌 astro-ph.SR

Binary Populations of Carbon-Enhanced Metal-Poor Stars

Robert G. Izzard (1 , 2) , Evert Glebbeek (2 , 3) , Richard J. Stancliffe (4 , 5) , Onno Pols (2) ((1) Institut d'Astronomie et d'Astrophysique , Universit\'e Libre de Bruxelles

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(2) Sterrenkundig Instituut Universiteit Utrecht (3) Department of Physics Astronomy McMaster University (4) School of Mathematical Sciences Monash University (5) Institute of Astronomy University of Cambridge)

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keywords modelsstarscarbon-enhancedcempmetalpoorratioasymptotic-giant

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We construct binary-star population nucleosynthesis models of carbon-enhanced metal poor (CEMP) stars. We compare the CEMP to EMP (extremely metal poor) ratio of our models to the observed ratio and find it is an order of magnitude too small. Through an increase in the efficiency of third dredge-up in low-mass, low-metallicity thermally-pulsing asymptotic-giant branch (TPAGB) stars our models better match the observations.

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Binary Populations of Carbon-Enhanced Metal-Poor Stars

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