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

TL;DR

This study investigates how stellar parameters relate to oscillation amplitudes in delta Scuti stars within open clusters, revealing a correlation that may inform mode selection rules.

Contribution

It introduces a correction method for stellar parameters accounting for fast rotation and explores correlations between inclination angle and oscillation amplitude.

Findings

Significant correlation between inclination angle and oscillation amplitude.

Correction method improves accuracy of stellar parameter estimation.

Proposes a possible selection rule for delta Scuti star oscillations.

Abstract

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