Stellar and Solar Magnetic Activity Cycles

恒星和太阳磁活动周期

• 批准号: 9114733
• 负责人: G. Wesley Lockwood
• 金额: --
• 依托单位: Lowell Observatory
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-11-15 至 1995-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9114733&HistoricalAwards=false
• 关键词: Stellar; Solar; Magnetic; Activity; Cycles

Using a dedicated high-dispersion fiber-fed spectrograph facility at the 1.1-m telescope of Lowell Observatory, we propose to study stellar/solar magnetic cycles and chromospheric activity The spectrograph records, using CCD detectors, the line profiles of Ca II at the K line (3933 ) and the infrared triplet (8542 ), and H. (6563 ) for solar-type stars and for the Sun itself, observed as just another star using the same instrument. The purpose of these observations is to use stellar cycles as tools to study the solar cycle. From detailed studies of cycle morphology (amplitude, shape, regularity) as a function of stellar mass, age, rotation rate, chemical composition, etc., we may hope to: (a) Infer the time-history of cyclic behavior for a star like the Sun over its entire lifetime, including information about the statistical frequency of major departures from "normal" behavior (e.g., Maunder minima); and (b) Obtain a broad perspective of the total ensemble of cycles possible, hence gain deep insight into the nature of stellar dynamos and into the ultimate origins of stellar magnetism. Stellar cycles provide complementary information unobtainable from observations of the Sun itself but of crucial importance to understanding the solar cycle.

利用洛厄尔天文台1.1米望远镜上的高色散光纤光谱仪，对恒星/太阳磁周期和色球活动进行了研究。(6563）对于太阳型恒星和太阳本身，使用相同的仪器观察到的只是另一颗星星。这些观测的目的是利用恒星周期作为研究太阳周期的工具。通过对周期形态（振幅、形状、规律性）作为恒星质量、年龄、旋转速率、化学成分等的函数的详细研究，我们希望：（a）推断像太阳这样的星星在其整个生命周期中周期性行为的时间历史，包括关于主要偏离“正常”行为的统计频率的信息（例如，Maunder minima）;和（B）获得可能的总系综的广阔前景，从而深入了解恒星发电机的性质和恒星磁性的最终起源。恒星周期提供了从太阳本身的观测中无法获得的补充信息，但对理解太阳周期至关重要。