Measurement of Stellar Parallaxes and Proper Motions

恒星视差和自行的测量

• 批准号: 9218605
• 负责人: Arthur Upgren
• 金额: --
• 依托单位: Wesleyan University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-02-01 至 1996-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218605&HistoricalAwards=false
• 关键词: Measurement; Stellar; Parallaxes; Proper; Motions

Trigonometric parallaxes of nearby stars are fewer in number and lower in precision than is generally perceived. Most parallax determinations are more than twenty years old and thus have errors much larger than those possible in recent years, even with conventional equipment. This program has made use of this increase in precision in obtaining parallaxes and proper motions since 1967. It is one of the two most extensive such programs now active. It would continue to enrich the number of high-precision parallaxes and photometry of stars of the lower main sequence, as well as subdwarf type stars. These stars are among the oldest in our Galaxy, and their parallaxes and distances are not now well known. It is expected that the program will calibrate the distance scale of these old stars with much greater precision than is now available. Photometry and possibly radial velocities are acquired as necessary. It is also intended that students will be trained in all aspects of the program.

附近恒星的三角测量在数量上和精度上都比通常认为的要少。大多数视差测定都是20多年前的事了，因此即使使用传统设备，误差也比近年来可能出现的误差大得多。自1967年以来，该程序就利用这种精度的提高来获得松弛和自行。这是目前正在实施的两个最广泛的此类方案之一。它将继续丰富低主序星以及亚矮星的高精度天文测量和光度测量的数量。这些恒星是我们银河系中最古老的恒星之一，它们的半径和距离现在还不是很清楚。预计该计划将以比现在更高的精度校准这些老恒星的距离标度。必要时可获得光度测定和可能的径向速度。它还打算，学生将在该计划的各个方面进行培训。