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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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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0005-CA7A-F Versions-Permalink: https://hdl.handle.net/21.11116/0000-0005-CA7B-E
Genre: Konferenzband

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externe Referenz:
https://ui.adsabs.harvard.edu/abs/2018pas6.conf..222V (beliebiger Volltext)
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 Urheber:
Vasilyev, Valeriy1, Autor
Ludwig, Hans-Günter1, Autor
Freytag, Bernd1, Autor
Lemasle, Bertrand1, Autor
Marconi, Marcella1, Autor
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

Inhalt

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Schlagwörter: -
 Zusammenfassung: 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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Sprache(n):
 Datum: 2018
 Publikationsstatus: Erschienen
 Seiten: 222-226
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
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 Identifikatoren: ISBN: 9788393827992
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Veranstaltung

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Titel: The RR Lyrae 2017 Conference. Revival of the Classical Pulsators: from Galactic Structure to Stellar Interior Diagnostics
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Start-/Enddatum: 2018

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