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Recent Insights in the Dynamical Structure of Cepheids' Atmosphere andProspect Concerning Hydrodynamical Modelling

Published online by Cambridge University Press:  15 August 2009

M. Goupil ,
Z. Kolláth ,
N. Nardetto ,
P. Kervella  and
N. Nardetto
N. Nardetto*
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
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Abstract

The link between the dynamical structure of Cepheid atmosphere and the distance scale calibration in the universe is now clearly established through a period-projection factor relation (Pp). However, to support future observations, we currently need fully consistent hydrodynamical models, including pulsating and evolutionary theories, convective energy transport, adaptive numerical meshes, and a refined calculation of the radiative transfer within the pulsating atmosphere and the expected circumstellar envelope (hereafter CSE). Confronting such models with observations (spectral line profiles, spatial- and spectral- visibility curves), will permit to resolve and/or strengthen subtle questions concerning (1) the limb-darkening, (2) the dynamical structure of Cepheids' atmosphere, (3) the expected interaction between the atmosphere and the CSE, and (4) it will bring new insights in determining the fundamental parameters of Cepheids. All these physical quantities are supposed furthermore to be linked to the pulsation period of Cepheids. From these studies, it will be possible to paint a glowing picture of all Cepheids within the instability strip, allowing an unprecedent calibration of the period-luminosity relation, leading to new insights in the fields of extragalactic distance scales and cosmology.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 38: Nonlinear Pulsations and Hydrodynamics of Cepheids , 2009 , pp. 133 - 141
Copyright
© EAS, EDP Sciences, 2009

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