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Proceedings

Spectroscopic Properties of a Two-Dimensional Cepheid Model

MPS-Authors

Vasilyev,  Valeriy
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ludwig,  Hans-Günter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Freytag,  Bernd
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lemasle,  Bertrand
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marconi,  Marcella
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018pas6.conf..222V
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Citation

Vasilyev, V., Ludwig, H.-G., Freytag, B., Lemasle, B., & Marconi, M. (2018). Spectroscopic Properties of a Two-Dimensional Cepheid Model.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CA7A-F
Abstract
The chemical composition of Cepheid variables can provide information on the chemo-dynamical evolution of the Galaxy and beyond. The standard method for determining atmospheric parameters and abundances of Cepheids is based on one-dimensional plane-parallel hydrostatic model atmospheres, where convection is treated by Mixing Length Theory. We check the validity of the quasi-static approach against a two- dimensional dynamical Cepheid model computed with CO5BOLD. The spectroscopic investigation of the two-dimensional Cepheid model allowed to derive projection factors and to explain the residual line-of-sight velocity of Galactic Cepheids, long known as the ``K-term'', by line shifts of convective origin. Moreover, hydrostatic 1D model atmospheres can provide unbiased estimates of stellar parameters and abundances of Cepheids for particular phases of their pulsations.