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Clues on the first stars from CEMP-no stars

Published online by Cambridge University Press:  09 May 2016

Arthur Choplin ,
Georges Meynet ,
André Maeder ,
Raphael Hirschi ,
Sylvia Ekström  and
Cristina Chiappini
Arthur Choplin
Affiliation:
Geneva Observatory, Geneva University, CH–1290 Sauverny, Switzerland email: arthur.choplin@unige.ch
Georges Meynet
Affiliation:
Geneva Observatory, Geneva University, CH–1290 Sauverny, Switzerland email: arthur.choplin@unige.ch
André Maeder
Affiliation:
Geneva Observatory, Geneva University, CH–1290 Sauverny, Switzerland email: arthur.choplin@unige.ch
Raphael Hirschi
Affiliation:
Astrophysics group, Keele University, Lennard-Jones Lab., Keele, ST5 5BG, UK
Sylvia Ekström
Affiliation:
Geneva Observatory, Geneva University, CH–1290 Sauverny, Switzerland email: arthur.choplin@unige.ch
Cristina Chiappini
Affiliation:
Leibniz-Institut fuer Astrophysik, An der Sternwarte 16, 14482 Potsdam, Germany
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Abstract

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The material used to form the CEMP-no stars presents signatures of processing by the CNO cycle and by He-burning from a previous stellar generation called spinstars. We compare the composition of the ejecta (wind + supernova) of a spinstar model to observed abundances of CEMP-no stars. We show that observed abundances as well as the isotope ratio 12C/13C may be reproduced by the spinstar ejecta if we assume different mass cuts when adding the supernova material to the wind ejecta.

Keywords

stars: evolutionrotationmassiveabundancesnucleosynthesischemically peculiar
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 282 - 283
Copyright
Copyright © International Astronomical Union 2016 

References

Aoki, W. 2010, Carbon-Enhanced Metal-Poor (CEMP) stars, Proc. IAU Symposium No. 265, p. 111Google Scholar
Norris, J. E., Yong, D., Bessell, M. S., et al. 2013, ApJ, 762, 28Google Scholar
Meynet, G., Hirschi, R., Ekstrom, S., et al. 2010, A&A, 521, A30Google Scholar
Maeder, A., & Meynet, G. and Chiappini, C. 2014, A&A, 576, A56Google Scholar
Chiappini, C., Ekström, S., Meynet, G., et al. 2008, A&A (Letters) 479, L9–L12Google Scholar