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Letter to the Editor
A nonlinear model for RR Lyrae double mode pulsation
Received 31 March 1998 / Accepted 22 July 1998
The Vienna nonlinear code for modelling pulsating stars is applied to the problem of RR Lyrae double mode pulsation. For stellar parameters of , and XYZ=(0.760, 0.239, 0.001) we find a stable double mode solution in a small effective temperature range around 6820 K. The fundamental period is given by days and period and amplitude ratios corresponding to and lie within the range of observed RR Lyrae double mode parameters.
Key words: stars: variables: RR Lyrae stars: oscillations methods: nonlinear methods: numerical
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Online publication: August 17, 1998