Problems with the Pulsation Mode Selection Mechanism in the Lower Instability Strip (Observations and Therory)

Details Problems with the Pulsation Mode Selection Mechanism in the Lower Instability Strip (Observations and Therory) Problems with the Pulsation Mode Selection Mechanism in the Lower Instability Strip (Observations and Therory)

2002-03-27

arxiv.org/abs/astro-ph/0203477v1

Astronomy and Astrophysics

Astrophysics

4 Pages, 2 Figures, Proceedings of IAU Coll. 185, ASP Conference Series in press; alternative Download from ftp://ftp.deltas

Scientific paper

We examine the severe disagreement between the number of predicted and observed pulsation modes for Delta Scuti stars. The selection of nonradial modes trapped in the outer envelope is considered on the basis of kinetic energy arguments. The trapped l=1 modes for the star 4 CVn are in good, but not perfect agreement with the observations. The trapping of the l=2 modes is weaker, so that this simple rule of mode selection may apply to l=1, and possibly not to l=2 modes.

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