Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..252s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 252-260.
Astronomy and Astrophysics
Astrophysics
23
Cepheid Variables, Fourier Analysis, Light Curve, Stellar Structure, Variable Stars, Radial Velocity, Stellar Models, Stellar Oscillations
Scientific paper
In a previous paper, simple models were used to generate a set of radial velocity curves showing the effect of varying amplitude and central condensation of a star. A single parameter adequately describes the variation in the shape of all the velocity curves considered: the skewness of the curve. In this paper, light curves generated by a nonadiabatic nonlinear one-zone model are considered. A set of curves with nearly constant skewness are used to show the importance of a second parameter: the narrowness or 'acuteness' of the curve, defined in the same way as the skewness parameter. This property of the light-curve shape is responsible for the smooth variation of Fourier phases seen in RR Lyrae stars and many Cepheids. In the one-zone model, the value of the acuteness is determined by the opacity variation in the deep envelope below the ionization zones; it could prove to be a probe of interior stellar structure.
Donohoe M.
Stellingwerf Robert F.
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