天琴RR型变星的绝对星等与运动学参数

Absolute Magnitude and the Kinematic Parameters of RR Lyrae Stars

对天琴ＲＲ型变星绝对星等与运动学参数的测定及其对确定距离、球状星四年龄估计的 影响，并对它们和其他距离指示器求得的结果的比较作了评述。由于不同作者采用的方法和 资料不同，结果的不确定性较大。例如由直接和间接测定方法决定的天琴ＲＲ型变星的绝对 星等分成较暗和较亮两类，由天琴ＲＲ型变星和其他距离指示器决定的大麦哲伦云（ＬＭＣ） 的距离模数和球状星团年龄估计并不完全一致。这表明还有一些天体测量和天体物理问题 需要深人研究。新的空间视差卫星和地基干涉测定计划将可能有助这些问题的解决。

The determinations of the absolute magnitude and the kinematic parameters of RR Lyrae stars, their effects on the estimations of the distances and the ages of the globular clusters, and the comparisons between the results and ones from other indicators of distances are reviewed. Due to the differences of the methods and the data, the inconsistence of the results are still larger among each other. For example, the absolute magnitude of RR Lyrae stars determined from the direct and indirect measurement methods splits into fainter and brighter values, the distance modulus of Large Magellanic Cloud (LMC) and the estimate of the ages of Globular Clusters based on the RR Lyrae stars and the other indicators of distances are not fully coincided. It shows that these remain some astrometrical and astrophysical problems which require fully research. The planes of the new space pallarax satellites and the ground-based speckle interferometry would be contributed better to resolve these problems.