Nonradial Modes in Classical Cepheids

Abstract

Systematic search for multiperiodicity in the LMC Cepheids (Moskalik, Kolaczkowski & Mizerski 2004) has led to discovery of low amplitude nonradial modes in a substantial fraction of overtone pulsators. We present detailed discussion of this new type of multimode Cepheid pulsators and compare them to similar nonradial pulsators discovered among RR Lyrae stars. Finally, we show first detections of secondary nonradial modes in FU/FO double-mode Cepheids.

7 pages, 4 figures. Poster presented at Wroclaw HELAS Workshop "Interpretation of Asteroseismic Data", 23-27 June 2008, Wroclaw, Poland. Shortened version will be published in Communications in Asteroseismology

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• The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. I. Classical Cepheids in the Large Magellanic Cloud
• Challenges for stellar pulsation and evolution theory