Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-07
Astronomy and Astrophysics
Astrophysics
Proceedings of the Monte Rosa Conference "GAIA spectroscopy, science and technology" Gressoney Saint Jean (Valle d'Aosta, Ital
Scientific paper
We argue that tracing star formation histories with ESA's space mission GAIA using main sequence turn-off (MSTO) point dating will mainly be effective in cases of mild interstellar extinction (E(B-V)<0.5). For higher reddenings the MSTO approach will be severely limited both in terms of traceable ages (t<0.5 Gyr at 8 kpc; E(B-V)=1.0) and/or distances (d<2 kpc for t=15 Gyr; E(B-V)=1.0), since the MSTO will be located at magnitudes too faint for GAIA. AGB stars may alternatively provide precise population ages with GAIA for a wide range of ages and metallicities, with traceable distances of up to 250 kpc at E(B-V)=0 (d=15 kpc if E(B-V)=2.0). It is essential however that effective temperatures precise to 0.01 dex, metallicities to 0.2 dex, and E(B-V) to 0.03 are derived for individual stars, in order to obtain their ages precise to 0.2 dex. This task is quite challenging for GAIA photometry and spectroscopy, though preliminary tests show that comparable precisions may be achieved with GAIA medium band photometry.
Kucinskas Arñas
Lindegren Lennart
Tanabe Tatsuyoshi
Vansevicius Vladas
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