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| Paper: |
The Problem of Mode Identification in roAp Stars: Multi-Colour Photometry |
| Volume: |
135, A Half Century of Stellar Pulsation Interpretations: a Tribute to Arthur N. Cox |
| Page: |
197 |
| Authors: |
Medupe, R.; Kurtz, D. W.; Christensen-Dalsgaard, J. |
| Abstract: |
Dziembowski (1977) proposed a modified Baade-Wesselink method for mode identification in a non-radially pulsating star with a well determined radius. Balona & Stobie (1979) recast this technique in an observationally feasible form, and applied it to some stars. This technique works for b Cephei, 53 Persei, d Scuti, Cepheid and ZZ Ceti variables, but does not work for rapidly oscillating Ap (roAp) stars. Here we outline the problem of mode identification in roAp stars and show how we shall attempt to solve it. We also apply the linearised expression (as in Watson 1988), for non-radial light variation, combined with the latest model atmospheres of roAp stars to the light and colour variation data to show the effect of improved model atmospheres on the Baade-Wesselink method and other mode discrimination techniques. |
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