Constraints on stellar convection from multi-colour photometry of δ scuti stars

Autor(en)

J Daszynska-Daszkiewicz, Wojciech A. Dziembowski, Aleksiej Pamiatnych

Abstrakt

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, l, 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 l from multi-colour data and apply it to three δ Scuti stars. The method indeed works. Determination of l 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.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Uniwersytet Wrocławski, Nicolaus Copernicus University

Journal

Astronomy & Astrophysics

Band

407

Seiten

999-1006

Anzahl der Seiten

8

ISSN

0004-6361

Publikationsdatum

2003

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/4016abd4-baeb-4e87-8583-fc9911ed5ae9