Abstract
In this Chapter, first we briefly discuss the impact of Population II and Globular Cluster (GCs) stars on the derivation of the age of the Universe, and on the study of the formation and early evolution of galaxies, our own in particular. The long-standing problem of the actual distance scale to Population II stars and GCs is then addressed, and a variety of different methods commonly used to derive distances to Population II stars are briefly reviewed. Emphasis is given to the discussion of distances and ages for GCs derived using Hipparcos parallaxes of local subdwarfs. Results obtained by different authors are slightly different, depending on different assumptions about metallicity scale, reddenings, and corrections for undetected binaries. These and other uncertainties present in the method are discussed. Finally, we outline progress expected in the near future.
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Gratton, R.G., Carretta, E., Clementini, G. (1999). Distances and Ages of Globular Clusters Using Hipparcos Parallaxes of Local Subdwarfs. In: Heck, A., Caputo, F. (eds) Post-Hipparcos Cosmic Candles. Astrophysics and Space Science Library, vol 237. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4734-7_6
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