High-dispersion Spectroscopic Observations and Lithium Abundance of the Chromospherically Active Solar-type Stars.

Based on the high signal-to-noise ratio (S/N) and high-dispersion spectroscopic observations, we derived the equivalent width of the Li I (λ = 6707.8 Å) and the lithium abundance for 9 active late-type stars. The correlation between the lithium abundance and the X-ray luminosity (lg L X) indicates that the lithium abundance of these 9 active late-type stars with a higher X-ray luminosity tends to be larger than that of those with lower X-ray luminosity. That is to say that the lithium abundances analogs progressively increase as the activity increases for these late-type stars. Considering both the lithium abundance and the rotational velocity decrease with increasing stellar age for main-sequence stars, and activity increasing with increasing rotation velocity for active late-type stars, like lithium abundance, the rotational velocity and stellar activity are also considered good indicators of age for late-type stars. [ABSTRACT FROM AUTHOR]