Fundamental Properties of Nearby Northern and Southern Stars

P.I. Phillip Ianna附近南北恒星的基本性质。构成我们星系的恒星的特征大致是从附近恒星的观测特性中推断出来的。这是我们可能期望最全面了解的样本，并拥有最好的观测数据。事实上，许多离我们最近的恒星缺乏最基本的测量，比如颜色、光谱类型，尤其是距离。恒星视差是校准各种恒星的光度所需的最基本的信息，因此为建立附近样本之外的物体的距离尺度提供了基础。伊安娜博士将继续指导一个项目，通过强调南半球CCD观测的三角视差法来确定与选定的候选恒星的距离。

AST 95-30831 P.I. Phillip Ianna Fundamental Properties of Nearby Northern and Southern Stars. The characteristics of stars populating our galaxy are broadly inferred from the observational properties of nearby stars. This is the sample we might expect to be known most completely, and to have the best observational data. In fact many of the nearest stars lack measurements of the most basic kind, such as colors, spectral types, or especially, distances. A stellar parallax is the most fundamental piece of information needed for calibrating the luminosities of a wide variety of stars and so providing the foundation for setting up the distance scale for objects beyond the nearby sample. Dr. Ianna will continue to direct a program to determine the distances to selected nearby star candidates by the trigonometric parallax method emphasizing CCD observations from the southern hemisphere.