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Carbon-enhanced metal-poor 3D model atmospheres

Published online by Cambridge University Press:  02 August 2018

M. Steffen ,
A. J. Gallagher ,
E. Caffau ,
P. Bonifacio  and
H.-G. Ludwig
M. Steffen
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, D-14482 Potsdam, Germany
A. J. Gallagher
Affiliation:
Max Planck Institut für Astronomie, D-69117 Heidelberg, Germany Observatoire de Paris, PSL Research University, CNRS, France
E. Caffau
Affiliation:
Observatoire de Paris, PSL Research University, CNRS, France
P. Bonifacio
Affiliation:
Observatoire de Paris, PSL Research University, CNRS, France
H.-G. Ludwig
Affiliation:
LSW, Zentrum für Astronomie, D-69120 Heidelberg, Germany
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Abstract

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We present our latest 3D model atmospheres for carbon-enhanced metal-poor (CEMP) stars computed with the CO5BOLD code. The stellar parameters are representative of hot turn-off objects (Teff ~ 6250 K, log g = 4.0, [Fe/H]=−3). The main purpose of these models is to investigate the role of 3D effects on synthetic spectra of the CH G-band (4140-4400 Å), the CN BX-band (3870-3890 Å), and several UV OH transitions (3122-3128 Å). By comparison with the synthetic spectra from standard 1D model atmospheres (assuming local thermodynamic equilibrium, LTE), we derive 3D abundance corrections for carbon and oxygen of up to −0.5 and −0.7 dex, respectively.

Keywords

hydrodynamicsradiative transferline: formationstars: chemically peculiar

Information

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 364 - 365
Copyright
Copyright © International Astronomical Union 2018 

References

Bonifacio, P., Caffau, E., Ludwig, H.-G., et al. 2013, MemSAIt Suppl., 24, 138Google Scholar
Gallagher, A. J., Caffau, E., Bonifacio, P., et al. 2016, A&A, 593, A48Google Scholar
Gallagher, A. J., Caffau, E., Bonifacio, P., et al. 2017, A&A, 598, L10Google Scholar