Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-28
Astron.Astrophys. 407 (2003) 999-1006
Astronomy and Astrophysics
Astrophysics
9 pages, 12 figures, to appear in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20030947
In Delta 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 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 spherical harmonic degree from multi-colour data and apply it to three Delta Scuti stars. The method indeed works. Determination of the degree appears unique and the inferred f's 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.
Daszy{ń}ska-Daszkiewicz Jadwiga
Dziembowski Wojciech A.
Pamyatnykh Alexey A.
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