Nonradial Pulsations in Classical Cepheids of the Magellanic Clouds

Details Nonradial Pulsations in Classical Cepheids of the Magellanic Clouds Nonradial Pulsations in Classical Cepheids of the Magellanic Clouds

2003-11-06

arxiv.org/abs/astro-ph/0311157v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in "Variable Stars in the Local Group", ASP Conference Series, eds. D. W. Kurtz & K. Pollard

Scientific paper

We have performed systematic frequency analysis of the LMC Cepheids observed by OGLE project. Several new types of pulsation behaviour are identified, including triple-mode and amplitude-modulated double-mode pulsations. In ~10% of the first overtone Cepheids we find low amplitude secondary periodicities corresponding to nonradial modes. This is the first evidence for excitation of nonradial oscillations in Classical Cepheid variables.

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