On application of multi-colour photometry of $\delta$ Scuti stars
Abstract
In $\delta$ Scuti star models, the photometric amplitudes and phases exhibit a strong dependence on convection, which enters through the complex parameter, $f$, which describes the bolometric flux variation. We present a new method of extracting simultaneously $\ell$ and $f$ from multi-colour data and apply it to several $\delta$ Scuti stars. The inferred values of $f$ are sufficiently accurate to yield an useful constraint on models of stellar convection. In addition, if the identified mode is radial, the multi-passband data may be used to refine global stellar parameters. Finally, the usage of radial velocity measurements to our method improves significantly determination of $\ell$ and $f$.
- Publication:
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arXiv e-prints
- Pub Date:
- September 2003
- DOI:
- 10.48550/arXiv.astro-ph/0309319
- arXiv:
- arXiv:astro-ph/0309319
- Bibcode:
- 2003astro.ph..9319D
- Keywords:
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- Astrophysics
- E-Print:
- 4 pages, 3 figures to appear in Proceedings of IAU Colloquium 193, Variable Stars in the Local Group, July 2003, Christchurch, New Zealand, ASP Conf. Ser., eds. D. W. Kurtz &