Constraints on the core μ-gradient of the solar-like star HD49385 via low-degree mixed modes

摘要

The existence of an l= 1 avoided crossing in the spectrum of the solar-like pulsator CoRoT~(**)-target HD49385 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 1.3M-star, HD49385 has had a convective core during its main sequence phase. The μ-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 μ-gradient in the core of the star.