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- W2138153684 abstract "We present high resolution observations of main se- quencestarsinthesolarage,solarmetallicityopenclusterM 67. For the rst time we show conclusively that a spread in lithium abundancesexistsamongsolar-typestarsbelongingtothisclus- ter. This implies that standard models with only convection as a mixing mechanism can hardly account for the spread at each colour, and that the Li abundance is not a good age indicator for solar-type stars. The comparison of Li abundances in M 67 (age 4:710 9 yrs) with those in the younger Hyades cluster ( 710 8 yrs) shows that the less depleted stars in M 67 have a Li content only 0.25 dex below similar stars in the Hyades. Considering the 4 Gyrs difference between the two clusters, this indicates that standard lithium destruction mechanisms are very inefcient (if present at all) in many solar-type stars dur- ing most of their main sequence lifetime. On the other hand, almost 40% of our sample stars show a signicant Li depletion, with values comparable to the Sun. Our sample also includes one SB2 binary, for which a very high Li abundance was pre- viously reported. We found an abundance signicantly higher than in single stars, but our spectra are inconsistent with those previously published." @default.
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- W2138153684 date "1997-09-01" @default.
- W2138153684 modified "2023-09-23" @default.
- W2138153684 title "LITHIUM IN M 67 : EVIDENCE FOR SPREAD IN A SOLAR AGE CLUSTER" @default.
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