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Hipparcos and the Age of the Galactic Disc
Raul Jimenez, Chris Flynn
We have used the Hipparcos satellite colour magnitude diagram to determine the age of the Galactic disc. We first measure the metallicities of Hipparcos giants using DDO photometry…
Dark galaxies, spin bias and gravitational lenses
Raul Jimenez, A. F. Heavens, M. R. S. Hawkins +1
Gravitational lensing studies suggest that the Universe may contain a population of dark galaxies; we investigate this intriguing possibility and propose a mechanism to explain the…
The Age of the Universe
Raul Jimenez
In this article I review the main methods for determining the age of the Universe. I describe how to determine the age of the oldest known systems at z=0, the system of galactic gl…
The ages and distances of globular clusters with the luminosity function method: the case of M5 and M55
R. Jimenez, P. Padoan
We present new age and distance determinations for the Galactic Globular Clusters M55 and M5, using the luminosity function method (Jimenez & Padoan 1996, Padoan & Jimenez 1997). W…