外行星宿主星Mu Arae的新地震分析
New seismic analysis of the exoplanet-host star Mu Arae
摘要：
我们提出了详细的建模的系外行星的主机星Mu Arae，使用一种新的方法进行asteroseismic分析，并考虑到最近派生的依巴谷视差的新值。目的是获得这颗恒星及其内部结构的精确参数，包括对核心超调的限制。我们在比Bazot等人（2005）更宽的范围内计算了新的恒星模型，具有各种化学成分（[Fe/H]和Y），在核心边缘有或没有过冲。我们计算了它们的绝热振荡频率，并将它们与地震观测结果进行了比较。对于每一组化学参数，我们保留代表最适合阶梯图的模型。然后，通过比较这些模型的有效温度，重力和光度与光谱误差盒，我们能够得出这颗恒星的精确参数。首先，我们发现所有正确符合阶梯图的模型都具有相同的质量和半径，不确定性为1%。第二，与光谱观测结果的最后比较得出的结论是，除了高金属丰度外，Mu Arae还具有Y=0.3的高氦丰度。知道这一点可以找到所有其他参数的精确值，质量，半径和年龄。
英文摘要：
We present detailed modelling of the exoplanet-host star Mu Arae, using a new method for the asteroseismic analysis, and taking into account the new value recently derived for the Hipparcos parallax. The aim is to obtain precise parameters for this star and its internal structure, including constraints on the core overshooting. We computed new stellar models in a wider range than Bazot et al. (2005), with various chemical compositions ([Fe/H] and Y), with or without overshooting at the edge of the core. We computed their adiabatic oscillation frequencies and compared them to the seismic observations. For each set of chemical parameters, we kept the model which represented the best fit to the echelle diagram. Then, by comparing the effective temperatures, gravities and luminosities of these models with the spectroscopic error boxes, we were able to derive precise parameters for this star. First we find that all the models which correctly fit the echelle diagram have the same mass and radius, with an uncertainty of the order of one percent. Second, the final comparison with spectroscopic observations leads to the conclusion that besides its high metallicity, Mu Arae has a high helium abundance of the order of Y=0.3. Knowing this allows finding precise values for all the other parameters, mass, radius and age.
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