Other
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..190m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 190-198.
Other
11
Cepheid Variables, Light Curve, Radial Velocity, Stellar Models, Stellar Oscillations, Fourier Analysis, Stellar Luminosity, Stellar Mass
Scientific paper
A survey of the nonlinear pulsational properties of nine sequences of low-luminosity Population II Cepheids has been made. The resulting light curves are discussed and confronted with the observational data. Despite the fact that the 2:1 resonance with the second overtone dominates the dynamical behavior of the models, the Fourier phase Phi(21) exhibits a monotone, nearly featureless progression as the period ratio P2/P0 is varied. This progression is very different from the one displayed by the radial velocity curves. It is also dramatically different from the Phi(21) progression found in the classical Cepheid models. On the other hand, it is in a qualitative agreement with the observed behavior of the BL Her stars. Also, in contrast to the classical Cepheids, we find the remaining Fourier parameters of the models to be extremely sensitive to stellar mass and luminosity. It is shown that a small, observationally acceptable dispersion of M and L can account for a very large variety of shapes among the BL Her light curves.
Buchler Jean-Robert
Moskalik Pawel
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