Impact of the physical processes in the modeling of HD49933

Abstract

Context : On its asteroseismic side, the initial run of CoRoT was partly devoted to the solar like star HD49933.The eigenmodes of this F dwarf have been observed with unprecedented accuracy. Aims : We investigate quantitatively the impact of changes in the modeling parameters like mass and composition. More importantly we investigate how a sophisticated physics affects the seismological picture of HD49933. We consider the effects of diffusion, rotation and the changes in convection efficiency. Methods : We use the CESAM stellar evolution code coupled to the ADIPLS adiabatic pulsation package to build secular models and their associated oscillation frequencies. We also exploited the hydrodynamical code STAGGER to perform surface convection calculations. The seismic variables used in this work are : the large frequency separation, the derivative of the surface phase shift,and the eigenfrequencies ${\nu }_{\mathrm{\ell }=0,\mathrm{n}=14}$ and ${\nu }_{\mathrm{\ell }=0,\mathrm{n}=27}$. Results : Mass and uncertainties on the composition have much larger impacts on the seismic variables we consider than the rotation. The derivative of the surface phase shift is a promising variable for the determination of the helium content. The seismological variables of HD49933 are sensitive to the assumed solar composition and also to the presence of diffusion in the models.

7 pages, 3 figures, 7 tables

References in corpus (3)

• Diagnoses to unravel secular hydrodynamical processes in rotating main sequence stars
• A spectroscopic study of southern (candidate) gamma Doradus stars. II. Detailed abundance analysis and fundamental parameters
• Energy transport, overshoot, and mixing in the atmospheres of M-type main- and pre-main-sequence objects

Cited by in corpus (8)

• CoRoT reveals a magnetic activity cycle in a Sun-like star
• The solar-like CoRoT target HD 170987: spectroscopic and seismic observations
• The diameter of the CoRoT target HD 49933. Combining the 3D limb darkening, asteroseismology, and interferometry
• Study of HD 169392A observed by CoRoT and HARPS
• Surface layer independent model fitting by phase matching: theory and application to HD49933 an HD177153 (aka Perky)
• Asteroseismic analysis of the CoRoT target HD49933
• Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis
• The CoRoT target HD49933: a possible seismic signature of heavy elements ionization in the deep convective zone