High resolution spectroscopy of Alpha Centauri. I - Lithium depletion near one solar mass

Details High resolution spectroscopy of Alpha Centauri. I - Lithium depletion near one solar mass High resolution spectroscopy of Alpha Centauri. I - Lithium depletion near one solar mass

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..427s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 2, Nov. 1984, p. 427-430. Research supported by the Smithsonian Insti

Astronomy and Astrophysics

Astrophysics

15

Binary Stars, Late Stars, Lithium, Stellar Composition, Stellar Spectra, Abundance, Metallicity, Stellar Evolution, Sun

Scientific paper

The lithium (Li) abundance of Alpha-Centauri A was measured and an upper limit was found for Li in Alpha Centauri B using the ESO Coude Echelle Spectrometer. The measurements were made in the 670.7 nm region in single-pass mode. The signal to noise ratio was not less than about 300 and was limited by the properties of the recorder. For Alpha-Centauri A the measured abundance was log N(Li) = 1.28, on a scale where log N(H) = 12.00. The upper limit for Li abundance in Alpha Centauri B was 0.7. It is shown that these abundances are consistent with the probable evolutionary age of the stars, given a mass of 1.1 solar mass for Alpha Centauri A. The lithium depletion e-folding time for that mass is therefore about 1.4 Gyr, compared to 1.1 Gyr at 1.0 solar mass. It is shown that the accuracy of estimates of the ages of individual stars based on Li abundances is limited when the masses are not precisely known. The age-related properties of solar-type stars that depend on Li abundances are discussed.

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