EDP Sciences
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Volume 478, Number 2, February I 2008
Page(s) 461 - 465
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20077683

A&A 478, 461-465 (2008)
DOI: 10.1051/0004-6361:20077683

Searching for p-modes in MOST Procyon data: another view

F. Baudin1, T. Appourchaux1, P. Boumier1, R. Kuschnig2, J. W. Leibacher1, 3, and J. M. Matthews2

1  Institut d'Astrophysique Spatiale, CNRS/Université Paris XI UMR 8617, 91405 Orsay, France
    e-mail: frederic.baudin@ias.u-psud.fr
2  Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver V6T 1Z1, Canada
3  National Solar Observatory, 950 N. Cherry Avenue, Tucson AZ 85719-4933, USA

(Received 20 April 2007 / Accepted 23 August 2007)

Context.Photometry of Procyon obtained by the MOST satellite in 2004 has been searched for p modes by several groups, with sometimes contradictory interpretations.
Aims.We explore two possible factors that complicate the analysis and may lead to erroneous reports of p modes in these data.
Methods.Two methods are used to illustrate the role of subtle instrumental effects in the photometry: time-frequency analysis, and a search for regularly spaced peaks in a Fourier spectrum based on the echelle diagramme approach.
Results.We find no convincing evidence of a p-mode signal in the MOST Procyon data. We can account for an apparent excess of power close to the p-mode frequency range and signs of structure in an echelle diagramme in terms of instrumental effects.

Key words: stars: oscillations -- methods: data analysis

© ESO 2008