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astro-ph2000
47 Tuc: The Spectroscopic Versus CMD Age Discrepancy
Alexandre Vazdekis, Maurizio Salaris, Nobuo Arimoto +1
We investigate current problems in obtaining reliable ages for old stellar systems based on stellar population synthesis modelling of their integrated spectra. In particular, we ad…
astro-ph2000
Atomic diffusion in metal poor stars. The influence on the Main Sequence fitting distance scale, subdwarfs ages and the value of Delta Y/DeltaZ
M. Salaris, M. A. T. Groenewegen, A. Weiss
The effect of atomic diffusion on the Main Sequence (MS) of metal-poor low mass stars is investigated. Since diffusion alters the stellar surface chemical abundances with respect t…