Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..191p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 1, p. 191-205
Astronomy and Astrophysics
Astrophysics
89
Abundance, Calcium, Dwarf Stars, G Stars, Iron, Lithium, Stellar Atmospheres, Stellar Models, Astronomical Catalogs, Astronomical Photometry, Chronology, Metallicity, Open Clusters, Statistical Analysis, Stellar Magnitude, Stellar Temperature
Scientific paper
We discuss Li abundances in a well defined sample of nearby (GO-G5) solar-like stars. High resolution (R = 100,000), high S/N (greater than or equal to 150) data have been analyzed using state-of-the-art techniques and up-to-date atmospheric models. We have investigated whether the abundance of Li in solar-type stars can be described in terms of stellar physical parameters like Teff, age and metallicity. We confirm the presence of a group of stars with high Li content, but apparently old age, finding that this group is rather conspicuous and not restricted to a few exceptional cases. The analysis of our data, together with published observations of G dwarfs in open clusters, strongly suggests that for stars older than approximately 1 Gyr another parameter in addition to the above mentioned ones plays a relevant role in Li depletion. When this additional mechanism is effective, it depletes Li by a factor 10-100, but in some stars it may not act at all during a large part of their main sequence lifetimes. We make some suggestions as to the nature of this additional parameter but none of them can be difinitely proven. When compared to the other stars in or sample, the Sun appears to be representative of the low-Li stars, which comprise about one half of the G dwarfs having stellar parameters and ages similar to the Sun. We confirm that Li is not a good tracer of age for solar-type stars, but we show that a high Li content coupled to high chromospheric activity can be used to identify stars significantly younger than the Hyades.
Liu Qiaohong
Pallavicini Roberto
Pasquini Luca
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