Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..724b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 724-739.
Astronomy and Astrophysics
Astrophysics
155
Dwarf Stars, Early Stars, F Stars, Lithium, Metallicity, Stellar Composition, Abundance, Astronomical Photometry, Spectral Line Width, Stellar Evolution, Stellar Rotation, Stellar Temperature
Scientific paper
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 (Wλ ≤ 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.
Boesgaard Ann Merchant
Tripicco Michael J.
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