EDP Sciences
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Volume 395, Number 2, November IV 2002
Page(s) 563 - 571
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20021322

A&A 395, 563-571 (2002)
DOI: 10.1051/0004-6361:20021322

Solar-like oscillations in $\delta$ Scuti stars

R. Samadi1, 2, M.-J. Goupil2 and G. Houdek3

1  Astronomy Unit, Queen Mary, University of London, London E14NS, UK
2  Observatoire de Paris, LESIA, CNRS FRE 2461, 92195 Meudon, France
3  Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA, UK

(Received 25 January 2002 / Accepted 5 September 2002 )

Model computations of $\delta$ Scuti stars, located in the vicinity of the red edge of the classical instability strip, suggest amplitudes of solar-like oscillations larger than in cooler models located outside the instability strip. Solar-like amplitudes in our $\delta$ Scuti models are found to be large enough to be detectable with ground-based instruments provided they can be distinguished from the opacity-driven large-amplitude pulsations. There would be advantages in observing simultaneously opacity-driven and stochastically excited modes in the same star. We anticipate their possible detection in the context of the planned asteroseismic space missions, such as the French mission COROT (COnvection ROtation and planetary Transits). We propose known $\delta$ Scuti stars as potential candidates for the target selection of these upcoming space missions.

Key words: stars: interiors -- stars: variables: $\delta$Sct

Offprint request: R. Samadi, Reza.Samadi@obspm.fr

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