A re-examination of the dispersion of lithium abundance of Pleiades member stars †*

The activity and dispersion of lithium abundance at a given color in the Pleiades member stars are re-examined in the present article. It is found that most of researchers underestimated the activity of the Pleiades stars. The activity of stars (including spot activities) and the influence of the inhomogeneous reddening effects over the cluster on the Li abundance dispersion are also restudied. The main conclusion obtained is that there is no solid evidence to suggest that the observed Li abundance dispersion represents the existence of the true difference of the Li abundance in the atmosphere of the cluster members with the same effective temperature. By contraries, if it is not the whole, most of the apparent Li abundance dispersion is caused by the atmospheric effect of active stars. The correlation between the Li abundance and stellar rotation very likely is only a reflection of the correlation between the Li abundance and stellar activity.