EDP Sciences
Free access
Volume 385, Number 3, April III 2002
Page(s) 793 - 801
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20020191

A&A 385, 793-801 (2002)
DOI: 10.1051/0004-6361:20020191

Search for second overtone mode Cepheids in Magellanic Clouds

II. Characteristics of second overtone mode pulsations
E. Antonello, D. Fugazza and L. Mantegazza

Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate, Italy

(Received 23 August 2001 / Accepted 17 January 2002)

The analysis of CCD observations of ten new suspected second overtone mode Cepheids in the SMC does not confirm the nature of such stars; most of them appear to be first overtone mode Cepheids. A careful analysis of the OGLE best second overtone mode candidates and of the second overtone component of double mode Cepheids in SMC and LMC has been performed in order to clarify the possible effects of a resonance between pulsation modes. There are some indications that such a resonance is indeed operating in these pulsators. A brief discussion of the effects of blending on the light curve shape is also reported, and the usefulness of the Fourier parameters as mode discriminators is discussed.

Key words: stars: oscillations -- stars: variables: Cepheids -- galaxies: Magellanic Clouds

Offprint request: E. Antonello, elio@merate.mi.astro.it

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