Observational Constraints on Mode Excitation in δ-Scuti Stars In Open Clusters

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Abstract
The special opportunities offered by δ-Scuti stars are the following: -They regularly oscillate in several modes, and with high precision observations one has measured of the order 5 modes (Michel and Baglin 1991 -The excitation is a very delicate and therefore a very sensitive measure of the internal structure. -They are found in open clusters which constitute a very rich scenario for tests of the theory of stellar structure and evolution. This makes it feasible to observe several stars simultaneously and gain more results than for single stars. -The brightness is moderately high and still they live long enough to be present in a variety of clusters and in the field as well.

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