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  Spectroscopic Properties of a Two-Dimensional Cepheid Model

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

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 Creators:
Vasilyev, Valeriy1, Author
Ludwig, Hans-Günter1, Author
Freytag, Bernd1, Author
Lemasle, Bertrand1, Author
Marconi, Marcella1, Author
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1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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 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.

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 Dates: 2018
 Publication Status: Issued
 Pages: 222-226
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISBN: 9788393827992
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Title: The RR Lyrae 2017 Conference. Revival of the Classical Pulsators: from Galactic Structure to Stellar Interior Diagnostics
Place of Event: -
Start-/End Date: 2018

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