# Inference for Stellar Opacities from Seismic Studies of the Hybrid $\beta$ Cep/SPB pulsators

## TL;DR

This study uses seismic data from three hybrid $eta$ Cep/SPB stars to infer stellar opacities, revealing the necessity for significant modifications to existing opacity profiles to match observations.

## Contribution

It introduces a comprehensive seismic modeling approach that incorporates the non-adiabatic parameter to refine stellar opacity profiles for hybrid pulsators.

## Key findings

- Models require significant opacity profile modifications.
- Non-adiabatic parameter $f$ effectively constrains solutions.
- Seismic data indicates discrepancies with standard opacities.

## Abstract

We present a comprehensive seismic study of the three pulsating stars of $\beta$ Cep/SPB type: $\nu$ Eridani, 12 Lacertae and $\gamma$ Pegasi. Models with the modified mean opacity profile are constructed in order to account for both the observed frequency range and the values of some individual frequencies. To decrease the number of possible solutions, we make use of the non-adiabatic parameter $f$, whose value is very sensitive to subphotospheric layers where pulsations are driven. This complex seismic modelling show the need for a significant modification of the opacity profile.