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Li abundances for solar twins in the open cluster M67
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abstract
We determine lithium (Li) abundances for solar twins in the M67 open cluster to add valuable information about the correlation between Li depletion and stellar age and, then, better understand stellar structure and evolution. We use high resolution and good signal-to-noise ratio spectra to characterize Li depletion in three solar twins from M67, using spectral synthesis in the region of the asymmetric 6707.75 \AA \, Li I feature. The mean Li abundance value of A(Li)$=1.6\pm0.2$ dex for our sample of M67 solar twins (our three stars plus a fourth solar twin from a previous analysis in the literature) presents Li abundance expected for its age. Also, the scatter estimated from the standard deviation of the Li abundances in this work is similar to the typical scatter found in a sample of field solar twins presented in the literature.
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Evidence for elemental diffusion in the eclipsing binary star AI Phoenicis
In the eclipsing binary AI Phe, the hotter component is depleted in Fe and Mg relative to its cooler subgiant companion by about 0.1 dex, matching the atomic-diffusion signature seen in the open cluster M67.
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