项目名称: 基于郭守敬望远镜恒星光谱库研究大样本晚型恒星的色球活动
项目编号: No.11263001
项目类型: 地区科学基金项目
立项/批准年度: 2013
项目学科: 数理科学和化学
项目作者: 张立云
作者单位: 贵州大学
项目金额: 60万元
中文摘要: 很多具有较深对流层和快速自转的晚型恒星存在着类似于太阳的磁活动现象,如:光球层上的黑子、色球层上的谱斑和耀斑等。目前为止,已有研究尽管观测了一些晚型恒星的磁活动现象,但由于样本偏少,对晚型恒星色球活动的性质和普遍规律(与光谱型等)仍不清楚。郭守敬望远镜(LAMOST)将观测几百万颗恒星的光谱,在这些数据中,可以发现大量的色球活动星。确实,我们已经在一小部分"先导巡天"数据中发现了100多颗色球活动星。通过大样本的光谱数据,探索不同光谱型晚型恒星的色球活动,研究其色球活动指标(H alpha、H beta、Ca II 红外三重线等)的性质,并测定其色球发射的等值宽度等,进而明确恒星的色球活动与光谱型之间的内在关系。这项研究不仅对揭示不同物理参数恒星磁活动的规律有重要意义,而且也为我们把太阳发电机理论扩展到类太阳恒星上奠定坚实的基础。期望本项目可以进一步推动西部欠发达地区贵州省天文学科的发展。
中文关键词: 晚型恒星;色球活动;光谱;郭守敬望远镜;
英文摘要: Many late-type stars with thick convective zones and rapid rotation exhibit the solar-like magnetic activity phenomena such as starspot in the photosphere, plage and flare in the chromosphere and so on. Although we have obtained the magnetic active phenomena of some late-type stars, it is still not clear on the common properties and regularities of the chromospheric activity of late-type stars. With a great number of spectroscopic samples across the entire optical bandpass, the Goushoujing telescope(LAMOST)project provides a great opportunity to find a large number of new chromospheric active stars and improve our understanding on this field. Therefore, we intend to research the chromospheric activity on the basis of a large samples of late-type stars with different spectral types available from the survey of the Goushoujing telescope. We have reduced a small part of "pilot survey" data and identified more than 100 chromospheric active stars. We can obtain their properties of the chromospheric activity indicators (H alpha, H beta, Ca II IRT, etc), and also measure the equivalent width of the chromospheric active indicators. To conclude, we wish to derive and establish the relations of the stellar magnetic activity with the spectral types. This project will not only reveal the constraint of the stellar principle
英文关键词: Late-type star;chromospheric activity;sepctra;LAMOST;