Volume 407, Number 3, September I 2003
|Page(s)||999 - 1006|
|Section||Stellar structure and evolution|
|Published online||17 November 2003|
Constraints on stellar convection from multi-colour photometry of δ Scuti stars
Astronomical Institute of the Wrocław University, ul. Kopernika 11, 51-622 Wrocław, Poland
2 Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
3 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium
4 Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
5 Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya Str. 48, 109017 Moscow, Russia
6 Institute of Astronomy, University of Vienna, Türkenschanzstr. 17, 1180 Vienna, Austria
Corresponding author: J. Daszyńska-Daszkiewicz, firstname.lastname@example.org
Accepted: 28 May 2003
In δ Scuti star models, the calculated amplitude ratios and phase differences for multi-colour photometry exhibit a strong dependence on convection. These observables are tools for the determination of the spherical harmonic degree, , of the excited modes. The dependence on convection enters through the complex parameter f, which describes bolometric flux perturbation. We present a method of simultaneous determination of f and harmonic degree from multi-colour data and apply it to three δ Scuti stars. The method indeed works. Determination of appears unique and the inferred values of f are sufficiently accurate to yield a useful constraint on models of stellar convection. Furthermore, the method helps to refine stellar parameters, especially if the identified mode is radial.
Key words: stars: variables: δ Scuti / stars: oscillation / convection
© ESO, 2003
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