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Lithium in early F dwarfs
Boesgaard, A. M.; Tripicco, M. J.
AA(Hawaii, University, Honolulu), AB(Hawaii, University, Honolulu)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 724-739. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Dwarf Stars, Early Stars, F Stars, Lithium, Metallicity, Stellar Composition, Abundance, Astronomical Photometry, Spectral Line Width, Stellar Evolution, Stellar Rotation, Stellar Temperature
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Abundances have been determined for Li in early F field dwarfs in order to determine the initial Li content for Population I stars. Reticon spectra were obtained at the coudé spectrograph of the CFH telescope of 75 F0 - F5 dwarfs with a spectral resolution of 0.11 Å. High S/N values allowed the observation of weak features (Wlambda <= 2 mÅ). Model atmospheres of Kurucz were used to calculate abundances from the Li I and Li I - Fe I blends, five Fe I lines, and one Ca I line. Lithium at the initial or "cosmic" abundance level was present in about one-third of the stars observed; the mean value is Li/H = 1.02×10-9. Lithium content and age are related with 62% of the stars younger than two billion years being Li-rich and 64% of the stars older than that being depleted by more than factors of 40. The relation of lithium abundance with metallicity, chromospheric activity and stellar rotation is discussed.

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