A study of correlation between the oscillation amplitude and stellar parameters for delta Scuti stars in open clusters. Toward selection rules for delta Scuti stars oscillations

摘要

In the present work, we study correlations between stellar fundamentalparameters and the oscillation amplitude for delta Scuti stars. We present thisstudy for a sample of 17 selected delta Scuti stars belonging to 5 young openclusters. Taking advantage of properties of delta Scuti stars in clusters, wecorrect the photometric parameters of our objects for the effect of fastrotation. We confirm the benefit of applying such corrections in this kind ofstudies. In addition, the technique used for this correction allows us toobtain an estimation of stellar parameters like the angle of inclination andthe rotation rate, usually not accessible. A significant correlation betweenthe parameter i' (estimation of the angle of inclination of the star) and theoscillation amplitude is found. A discussion and interpretation of these apriori surprising results is proposed, in terms of a possible selection rulefor oscillation modes of delta Scuti stars.