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Nonradial Pulsations in Classical Cepheids of The Magellanic Clouds

Published online by Cambridge University Press:  12 April 2016

Paweł Moskalik ,
Zbigniew Kołaczkowski  and
Tomasz Mizerski
Paweł Moskalik
Affiliation:
Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland
Zbigniew Kołaczkowski
Affiliation:
Wrocław University Observatory, ul. Kopernika 11, 51-622 Wrocław, Poland
Tomasz Mizerski
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

Abstract

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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.

Type
Part 9. Evolutionary and pulsation properties of variable stars
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 498 - 501
Copyright
Copyright © Astronomical Society of the Pacific 2004

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