Hipparcos和主要距离标度指标

C. Turon
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引用次数: 0

摘要

喜巴可思的数据在质量和数量上都大大增加了现有的基本距离信息。例如,Hipparcos数据和地面数据的相对精度高于10%的恒星数量分别为22 396颗和1000颗左右。此外,光谱类型和光度等级的范围也大大扩大了,其中包括疏散星团中的许多恒星和少数造父变星和天琴座RR星。主序的底部被填充到绝对的Hp等14,包括一些亚矮星,这对于推断球状星团的距离和年龄至关重要(Pont et al, 1997a)。
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Hipparcos and Primary Distance Scale Indicators
The Hipparcos data are providing a dramatic increase, qualitatively and quantitatively, of the basic available distance information. For example, the numbers of stars for which a relative accuracy better than 10 % is available from Hipparcos data and from ground-based data are respectively 22 396 and about 1000. Moreover, the range of spectral types and luminosity classes for which precise parallaxes are available is considerably enlarged, including many stars in open clusters and a small number of Cepheids and RR Lyrae. The bottom of the main sequence is populated down to absolute Hp magnitude 14, including a number of subdwarf stars essential to derive globular clusters distances and ages (Pont et al, 1997a).
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