Fundamental Properties of Nearby Northern and Southern Stars

附近的北方恒星和南方恒星的基本特性

• 批准号: 9820711
• 负责人: Philip Ianna
• 金额: $ 33万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-05-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9820711&HistoricalAwards=false
• 关键词: Fundamental; Properties; Nearby; Northern; Southern

Ianna, PhilipAST-9820711The characteristics of stars populating our galaxy are broadly inferred from the observed properties of the nearby stars. This is the sample we might expect to be known most completely, down to the very faintest stars possible, and to have the best observational data. In fact, many of the nearest stars lack basic measurements such as colors, spectral types, and especially distances, and many new objects are yet to be discovered. Dr. Ianna's program focuses on providing these basic data and on expanding the sample of nearby stars through determination of distances by the trigonometric parallax method emphasizing CCD observations from the southern hemisphere. His program includes some of the faintest known stars, several brown dwarfs, and subdwarfs, stars from the oldest populations in our galaxy. His surveys will also discover binary stars, for which masses will be determined. The program of observations will help to complete the stellar census of the solar neighborhood, clarify the form of the faint end of the luminosity and mass distribution functions, and contribute to our understanding of the formation and evolution of stellar populations.

Ianna，PhilipAST-9820711居住在我们星系中的恒星的特征主要是从附近恒星的观测特性中推断出来的。 这是我们可能期望知道的最完整的样本，直到最微弱的恒星，并拥有最好的观测数据。 事实上，许多最近的恒星缺乏基本的测量，如颜色，光谱类型，特别是距离，还有许多新的物体尚未被发现。 Ianna博士的方案侧重于提供这些基本数据，并通过三角视差法确定距离，扩大邻近恒星的样本，强调从南半球进行CCD观测。 他的计划包括一些已知的最暗的恒星，几颗褐矮星和次矮星，这些恒星来自我们银河系中最古老的恒星。 他的巡天还将发现双星，并确定其质量。 该观测计划将有助于完成太阳邻域的恒星普查，澄清光度和质量分布函数的暗端形式，并有助于我们理解恒星种群的形成和演化。