红巨星∈Ophiuchi的类太阳振动  

Solar-like Oscillations in the Red Giant ε Ophiuchi

作　　者：刘志娥[1] 唐延柯[1] 盖宁[1] 

机构地区：[1]中国科学院国家天文台/云南天文台

出　　处：《天文学报》2008年第2期159-167,共9页Acta Astronomica Sinica

基　　金：国家科技部(2007CB815406);国家自然科学基金(10173021，10433030，10773003和10778601)资助项目资助项目

摘　　要：最近在红巨星∈Ophiuchi(G9.5Ⅲ)中观测到了类太阳振动.大频率间隔为4.8μHz,并证实了∈Ophiuchi中存在非径向振动模.依据∈Ophiuchi红巨星观测到的振动频率数据和它在赫罗图中的位置,采用恒星演化计算与恒星振动计算相结合的方法,对∈Ophiuchi红巨星的质量、金属丰度、年龄、半径进行了初步的限制.Recently solar-like oscillation has been observed in red giant ∈ 0phiuchi （G9.5III）. At the same time, astrophysical observation has observed a set of frequencies, the position of ∈0phiuchi and the large frequency separation, 4.8μHz. According to the data of observed oscillation frequencies and the position of ∈ 0phiuchi in the H-R diagram, the method associating to the calculation of the stellar evolution and the stellar oscillation has been used to constrain originally parameters of ∈ 0phiuchi, including mass, age, mixing length and metallicity. In the paper it is only considered how to select the suitable initial mass and chemical abundance, especially metallicity and the mixing length to let the model reach the observed position of ∈ 0phiuchi from the zero age main sequence in the HR diagram. The data of the model are utilized to calculate the oscillation information. If the computed frequencies fit the observed frequencies well, the information of the interior structure and the important parameters of ∈ 0phiuchi, such as mass, chemical abundance, age and so on can be got. At last the mass, chemical abundance, and age of ∈ 0phiuchi are roughly limited.

关 键 词：恒星 振动 恒星 红巨星 

分 类 号：P15[天文地球—天文学]