Constraints on the core µ -gradient of the solar-like star HD 49385 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 HD 49385 (*The CoRoT space mission, launched on 2006 December 27, was developed and is operated by the CNES with participation of the Science Programs of ESA; ESA''s RSSD, Austria, Belgium, Brazil, Germany, and Spain.) 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 M⊙ -star, HD 49385 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 (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)