Analysis of the adiabatical pulsation of Cepheids
H. Dehnena, M.G. Corona-Galindob, A.L. Gelover-Santiagoc
a Konstanz Universitaet, Fakultaet fuer Physik, Postfach 55 60, 7750 Konstanz, Germany, e-mail: Heinz.Dehnen@uni-konstanz.de
b Instituto Nacional de Astrofísica, (Óptica y Electrónica, Apartado Postal 216, 72840 Tonantzintla, Puebla, México, e-mail: mcorona@inaoep.mx
c Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, México D.F. 04510, e-mail: gelover@unam.mx
]]>Received 30 April 2015;
accepted 13 October 2015
Abstract
A model for the adiabatical pulsation of a Cepheid based on primary physical principles such as energy conservation, mechanical adiabaticity and hydrostatic equilibrium is presented. The adiabatical treatment of the pulsation has been already studied by other authors but the novelty of our model is that it allows to obtain physical parameters of the star, namely the amplitude of the oscillation, the mass, maximal velocity of the pulsation and luminosity.
Keywords: Geophysics; astronomy and astrophysics; stars; variable; peculiar stars; cepheids.
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