Hybrid gamma Doradus/delta Scuti Stars: Comparison Between Observations and Theory

TL;DR

This paper compares observed hybrid gamma Doradus/delta Scuti stars with theoretical models predicting their existence, focusing on pulsation modes and the interaction between convection and pulsations.

Contribution

It provides a detailed comparison between observed hybrid pulsators and non-adiabatic theoretical models including convection-pulsation interaction.

Findings

Observed hybrid stars show p and g-modes consistent with models.

Theoretical predictions align with the existence of hybrid pulsators.

Convection-pulsation interaction is crucial for understanding hybrid star behavior.

Abstract

Gamma Doradus are F-type stars pulsating with high order g-modes. Their instability strip (IS) overlaps the red edge of the delta Scuti one. This observation has led to search for objects in this region of the HR diagram showing p and g-modes simultaneously. The existence of such hybrid pulsators has recently been confirmed (Handler 2009) and the number of candidates is increasing (Matthews 2007). From a theoretical point of view, non-adiabatic computations including a time-dependent treatment of convection (TDC) predict the existence of gamma Dor/delta Sct hybrid pulsators (Dupret et al. 2004; Grigahcene et al. 2006). Our aim is to confront the properties of the observed hybrid candidates with the theoretical predictions from non-adiabatic computations of non-radial pulsations including the convection-pulsation interaction.