Distances and Absolute Ages of Galactic Globular Clusters from Hipparcos Parallaxes of Local Subdwarfs∗

@inproceedings{Gratton1997DistancesAA,
  title={Distances and Absolute Ages of Galactic Globular Clusters from Hipparcos Parallaxes of Local Subdwarfs∗},
  author={Raffaele G. Gratton and Flavio Fusi Pecci and Elisa Carretta and G. Clementini and Claudia Corsi and Mario Gilberto Lattanzi},
  year={1997}
}
High precision trigonometric parallaxes from the HIPPARCOS satellite and accurate metal abundances ([Fe/H], [O/Fe], and [α/Fe]) from high resolution spectroscopy for about 30 local subdwarfs have been used to derive distances and ages for a carefully selected sample of nine globular clusters. We find that HIPPARCOS parallaxes are smaller than the corresponding ground-based measurements leading, to a longer distance scale (∼ 0.2 mag) and to ages ∼ 2.8 Gyr younger. The relation between the zero… CONTINUE READING
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