The role of negative buoyancy in convective Cepheid models. Double-mode pulsations revisited

Details The role of negative buoyancy in convective Cepheid models. Double-mode pulsations revisited The role of negative buoyancy in convective Cepheid models. Double-mode pulsations revisited

2008-10-20

arxiv.org/abs/0810.3507v1

CoAst.157:149-153,2008

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, contributed talk presented at the HELAS Workshop "Interpretation of Asteroseismic Data" (Wroclaw, June 200

Scientific paper

The longstanding problem of modeling double-mode behaviour of classical pulsators was solved with the incorporation of turbulent convection into pulsation hydrocodes. However, the reasons for the computed double-mode behaviour were never clearly identified. In our recent papers (Smolec & Moskalik 2008a,b) we showed that the double-mode behaviour results from the neglect of negative buoyancy effects in some of the hydrocodes. If these effects are taken into account, no stable non-resonant double-mode behaviour can be found. In these proceedings we focus our attention on the role of negative buoyancy effects in classical Cepheid models.

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