Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..765k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 2, p. 765-772.
Physics
27
Stellar Models, Stellar Oscillations, Stellar Physics, Variable Stars, Energy Dissipation, Hydrodynamics, Viscosity
Scientific paper
Tests made with a standard, purely radiative hydrodynamical code show that sustained double-mode pulsations of RR Lyrae models with the observed periods are possible. The basic difference with our previous simulations is that the new ones have less dissipation due to reduced artificial viscosity. As a result, some models have larger amplitudes than those given by the observations. The double-mode behavior is demonstrated for several models in a sequence that is representative of Oosterhoff II variables. Similar results are also found for Oosterhoff I stars. It is suggested that a high-order resonance among the lowest three modes is instrumental in causing double-mode behavior in these models. The amplitude ratio in the final mixed-mode state is sensitive to the actual values of the artificial parameters and may depend on the initial conditions. We discuss the relevance of these tests and their impact on future simulations with more physical, i.e., numerically less dissipative and convective codes.
Buchler Jean-Robert
Kovacs Geza
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