Volume 375, Number 1, August III 2001
|Page(s)||113 - 121|
|Section||Interstellar and circumstellar matter|
|Published online||15 August 2001|
20 CVn: A monoperiodic radially pulsating δ Scuti star*
Observatoire de la Côte d'Azur, UMR 6528, BP 4229, 06304 Nice Cedex 04, France
2 European Southern Observatory, Alonso de Cordova 3107-Vitacura, PO 19001 Santiago, Chile
3 Katholieke Universiteit Leuven, Instituut voor Sterrenkunde, Celestijnenlaan 200 B, 3001 Leuven, Belgium
Corresponding author: M. Chadid, firstname.lastname@example.org
Accepted: 30 May 2001
We present a new spectroscopic study of the δ Scuti star 20 CVn in order to solve the controversy on the type of pulsation mode of this object. The spectra were obtained at the Observatoire de Haute-Provence, with the Echelle spectrograph ELODIE. Using the correlation configuration of the instrument, sinusoidal moment variations are clearly detected, with a frequency in perfect agreement with the photometric one. Using the moment method, we conclude that only the radial mode is able to explain the observed moment variations and leads to a good fit to the observed line profiles. The new data thus allow us to confirm the photometric results, i.e. 20 CVn exhibits a monoperiodic radial pulsation.
Key words: stars: oscillations / stars: variables: δ Sct / stars: individual: 20 CVn
© ESO, 2001
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