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Astron. Astrophys. 334, L1-L4 (1998)

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Letter to the Editor

Are low-order resonances observed in Mira pulsation? *

D. Barthès 1, M.O. Mennessier 1, J.L. Vidal 1 and J.A. Mattei 2

1 Groupe de Recherche en Astronomie et Astrophysique du Languedoc (UPRESA 5024 CNRS), Université Montpellier II,
F-34095 Montpellier Cedex 05, France
2 American Association of Variable Star Observers, 25 Birch Street, Cambridge MA 02138-1205, USA

Received 12 March 1998 / Accepted 3 April 1998


The possibility of a low-order, two-mode resonance in the pulsation of LPVs is investigated by means of Fourier analysis of lightcurves, supplemented by spectral types and by kinematic population analysis based on HIPPARCOS astrometric data. The question might be positively answered.

Key words: stars: AGB – stars: oscillations – stars: variables: long-period variables

* Based on data from the HIPPARCOS astrometry satellite.

SIMBAD Objects


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© European Southern Observatory (ESO) 1998

Online publication: May 12, 1998