Constraints on the core mu-gradient of the solar-like star HD 49385 via low-degree mixed modes

TL;DR

This paper investigates how the observed avoided crossing in the solar-like star HD 49385 constrains the mu-gradient near its core, providing insights into internal stellar processes post main sequence.

Contribution

It offers the first detailed analysis of the mu-gradient constraints derived from mixed mode observations in HD 49385, a post main sequence solar-like star.

Findings

Confirmed the presence of an l=1 avoided crossing in HD 49385.

Provided constraints on the mu-gradient in the star's core.

Enhanced understanding of core boundary processes in post main sequence stars.

Abstract

The existence of an l=1 avoided crossing in the spectrum of the solar-like pulsator CoRoT-target HD 49385 was established by Deheuvels & Michel (2009). It is the first confirmed detection of such a phenomenon. The authors showed in a preliminary modeling of the star that it was in a post main sequence status. Being a 1.3 Msun-star, HD 49385 has had a convective core during its main sequence phase. The mu-gradient left by the withdrawal of this core bears information about the processes of transport at the boundary of the core. We here investigate the constraints that the observed avoided crossing brings on the mu-gradient in the core of the star.