Abstract
Current Galactic disk age determinations are carried out by dating either the oldest open clusters with theoretical isochrones, or the oldest white dwarfs with cooling sequences. Nucleocosmochronology is the determination of time scales using abundances of radioactive nuclides. It can be used to date the Galactic disk with low dependence on stellar evolution calculations. The nuclides used by us to accomplish this are 232Th, with a 14Gyr half-life (i.e., of the order of magnitude of the age being assessed), and 151,153Eu, the two stable isotopes of the comparison element (97% produced by the same nucleosynthesis process as all Th, the r-process). The sample is composed of 20 thin disk dwarfs/subgiants with F5–G9 spectral types, 5600 < T eff(K) < 6300 and −0.84 ≤ [Fe/H] ≤ +0.28. A complete description of this work can be found in [1] and [2].
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References
1. E.F. del Peloso, L. da Silva, G.F. Porto de Mello: A&A, accepted for publication (2004)
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del Peloso, E., da Silva, L., Arany-Prado, L., de Mello, G.P. (2006). Determination of the Age of the Galactic Thin Disk from Th/Eu Stellar Abundance Ratios. In: Randich, S., Pasquini, L. (eds) Chemical Abundances and Mixing in Stars in the Milky Way and its Satellites. ESO ASTROPHYSICS SYMPOSIA. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-34136-9_15
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