Spectroscopic Studies of Stellar Activity

在过去的十年里，天文学家已经认识到， 其表面条件与太阳的表面条件相似 “活动周期”很像太阳黑子周期。 希望 研究恒星活动周期将有助于更好地 了解太阳及其对地球环境的影响。 主要研究者建议继续他们目前的研究， 美国国家科学基金会资助的光谱研究恒星活动的晚型 星 他们将集中研究像RSCVn这样的变星 系统，选定的主序前（金牛座T）恒星，天龙座 变星和类似太阳的磁性恒星。 高精度 光谱的星星南河三，目的是检测p-模式 振荡，也将进行。 他们还将 把太阳当作一颗遥远的活跃星星来监测， 以便更好地解释恒星活动周期。 本次调查的长期目标是1。了解 较好地反映了活动恒星之间的异同; 2.到 确定恒星活动变化的时间尺度; 3. 来估计产生恒星表面的物理条件 活动

During the past decade astronomers have recognized that other stars with surface conditions similar to that of the sun go through "activity cycles" much like the solar sunspot cycle. It is hoped that studying stellar activity cycles will contribute to a better understanding of the sun and its effect on terrestrial conditions. The Principal Investigators propose to continue with their current NSF funded spectroscopic study of stellar activity in late type stars. They will concentrate on such variable stars as RS CVn systems, selected pre-main sequence (T Tauri) stars, BY Draconis variable stars, and magnetic solar-like stars. High precision spectroscopy of the star Procyon, with the aim of detecting p-mode oscillations, will be carried out as well. They also will be monitoring the sun as if it were a distant active star, in order to be better able to interpret stellar activity cycles. The long-term goals of this investigation are 1. to understand better the similarities and differences among active stars, 2. to determine the time scales of changes in stellar activity, and 3. to estimate the physical conditions giving rise to stellar surface activity.