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Astron. Astrophys. 337, L29-L33 (1998)

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Letter to the Editor

A nonlinear model for RR Lyrae double mode pulsation

M.U. Feuchtinger

Institut für Astronomie der Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria

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 [FORMULA], [FORMULA] 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 [FORMULA] days and period and amplitude ratios corresponding to [FORMULA] and [FORMULA] lie within the range of observed RR Lyrae double mode parameters.

Key words: stars: variables: RR Lyrae – stars: oscillations – methods: nonlinear – methods: numerical

Send offprint requests to: M.U. Feuchtinger,

© European Southern Observatory (ESO) 1998

Online publication: August 17, 1998