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The Evolutionary State of CEMP Stars

Published online by Cambridge University Press:  30 December 2019

Johannes Andersen Open the ORCID record for Johannes Andersen [Opens in a new window]  and
Birgitta Nordström
Johannes Andersen
Affiliation:
Dark Cosmology Centre, The Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark. Stellar Astrophysics Centre, Aarhus University, Aarhus, Denmark. DK–2100 Copenhagen, Denmark emails: ja@nbi.ku.dk, birgitta@nbi.ku.dk
Birgitta Nordström
Affiliation:
Dark Cosmology Centre, The Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark. Stellar Astrophysics Centre, Aarhus University, Aarhus, Denmark. DK–2100 Copenhagen, Denmark emails: ja@nbi.ku.dk, birgitta@nbi.ku.dk
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Abstract

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The standard scenario for the production of carbon-enhanced extremely metal-poor (CEMP) stars requires a more massive binary companion, which has evolved through the AGB stage and transferred carbon-rich material to the surface of the surviving, likewise extremely metal-poor (EMP) star. Evidently, the binary companion plays a key role in this process.

In order to characterise the polluting star, if any, the stage of evolution of the observed star (whether RGB or AGB), and whether pulsations exist, must be known. The Gaia DR2 parallaxes and photometry should contain the answer.

Keywords

Galaxy: halostars: Population IIstars: AGB and post-AGBstars: carbonstars: distancesstars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 345 - 346
Copyright
© International Astronomical Union 2019 

References

Hansen, T.T., Andersen, J., Nordström, B. et al., 2015, The role of binaries in the enrichment of the early Galactic halo. I. The r-process enhanced metal-poor stars, A&A, 583, A49 CrossRefGoogle Scholar
Hansen, T.T., Andersen, J., Nordström, B. et al., 2016a, The role of binaries in the enrichment of the early Galactic halo. II. Carbon-Enhanced Metal-Poor Stars -– the CEMP-no stars, A&A, 586, A160 CrossRefGoogle Scholar
Hansen, T.T., Andersen, J., Nordström, B. et al., 2016b, The role of binaries in the enrichment of the early Galactic halo. III. Carbon-Enhanced Metal-Poor Stars -– the CEMP- s stars, A&A, 588, A3 CrossRefGoogle Scholar