EDP Sciences
Free access
Volume 391, Number 2, August IV 2002
Page(s) 795 - 799
Section Instruments, observational techniques and data processing
DOI http://dx.doi.org/10.1051/0004-6361:20020897

A&A 391, 795-799 (2002)
DOI: 10.1051/0004-6361:20020897

Research Note

The effects of blending on the light curve shape of Cepheids

E. Antonello

Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate, Italy
(Received 18 February 2002 / Accepted 4 June 2002)

A short analysis is presented of the effects on the cepheid light curve shape, i.e. on the Fourier parameters usually adopted for its description, of the blending of the stellar image with other close stars. The conclusion is that, within reasonable error, the effects are in general small and the Fourier decomposition is confirmed to be a useful tool for pulsation mode discrimination. A large effect has been found on the phase differences in a narrow period range corresponding to the known resonance centers between pulsation modes.

Key words: stars: oscillations -- stars: variables: Cepheids -- galaxies: stellar content

© ESO 2002