Exploring the effects of detailed chemical profiles on the adiabatic oscillation spectrum of sdB stars: First Results

TL;DR

This study investigates how detailed chemical profiles, especially diffusion and He-burning processes, influence the pulsation spectra of sdB stars, highlighting implications for asteroseismology and stellar interior modeling.

Contribution

It provides new insights into the effects of chemical transitions and diffusion on sdB star pulsations, emphasizing the potential to constrain core mixing processes.

Findings

Diffusion reduces mode trapping efficiency in sdB stars.

Chemical transition details significantly affect pulsation spectra.

Asteroseismology can constrain core mixing in horizontal branch stars.

Abstract

We present results of an ongoing study of the pulsational properties of sdB stellar models aimed at exploring the consequences of detailed chemical transitions for radial, $p-$ and $g-$ modes. In particular, we focus on the effects of diffusion at the H-He transition and of He-burning at the convective cores. We find that diffusion of He and H has a strong impact on the period spectrum of sdBVs stars, leading to less efficient mode trapping. Our results also suggests that asteroseismology of sdBVs stars might offer a very good opportunity to constrain extramixing processes in the He-burning cores of horizontal branch stars.