物理过程对HD49933建模的影响
Impact of the physical processes in the modeling of HD49933
摘要：
内容：在它的星震方面，CoRoT的初始运行部分用于类日星HD 49933。目的：我们定量研究的影响，如质量和成分的建模参数的变化。更重要的是，我们研究了复杂的物理学如何影响HD49933的地震学图像。我们考虑扩散，旋转和对流效率的变化的影响。研究方法：我们使用CESAM的恒星演化代码耦合到ADIPLS绝热脉动包建立长期模型和相关的振荡频率。我们还利用流体动力学代码STAGGER进行表面对流计算。在这项工作中使用的地震变量是：大的频率分离，表面相移的导数，和本征频率$\rm ν_{\ell=0,n=14}$和$\rm ν_{\ell=0,n=27}$。结果：质量和成分的不确定性对我们考虑的地震变量的影响比旋转大得多。表面相移的导数是用于测定氦含量的有希望的变量。HD 49933的地震学变量对假设的太阳成分和模型中扩散的存在都很敏感。
英文摘要：
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 $\rm ν_{\ell=0,n=14}$ and $\rm ν_{\ell=0,n=27}$. 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.
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