Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-29
Mon.Not.Roy.Astron.Soc. 354 (2004) 212
Astronomy and Astrophysics
Astrophysics
13 pages, 11 figures and 5 tables. MNRAS submitted
Scientific paper
10.1111/j.1365-2966.2004.08183.x
In this paper, we construct full amplitude non-linear hydrodynamical models of fundamental mode Galactic Cepheids and analyze the resulting theoretical period-colour and amplitude-colour relations at maximum, mean and minimum light. These theoretical relations match the general form of the observed relations well. This agreement is, to some extent, independent of the mass-luminosity relations used, pulsation code, numerical techniques, details of the input physics and methods to convert theoretical quantities, such as bolometric luminosity and temperature, to observational quantities, such as V band magnitudes or $(V-I)$ colours. We show that the period-colour and amplitude-colour properties of fundamental mode Galactic Cepheids with periods such that $\log (P)>0.8$ can be explained by a simple application of the Stefan-Boltzmann law and the interaction of the photosphere with the hydrogen ionization front. We discuss the implications of our results for explaining the behavior of Galactic Cepheid period-colour, and period-luminosity relations at mean light.
Buchler Robert
Kanbur Shashi
Ngeow Chow Choong
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