摘要：Context.We report results from lithium abundance determinations using high resolution spectral analysis of the 107 metal-rich stars from the Calan-Hertfordshire Extrasolar Planet Search programme.Aims.We aim to set out to understand the lithium distribution of the population of stars taken from this survey.Methods.The lithium abundance taking account of non-local thermodynamical equilibrium effects was determined from the fits to the Li I 6708 Å resonance doublet profiles in the observed spectra.Results.We find that a) fast rotators tend to have higher lithium abundances; b) logN(Li) is higher in more massive and hot stars; c) logN(Li) is higher in stars of lower logg; d) stars with the metallicities >0.25 dex do not show the lithium lines in their spectra; e) most of our planet hosts rotate slower; and f) a lower limit of lithium isotopic ratio is7Li/6Li > 10 in the atmospheres of two stars with planets (SWP) and two non-SWP stars.Conclusions.Measurable lithium abundances were found in the atmospheres of 45 stars located at distances of 20−170 pc from the Sun, for the other 62 stars the upper limits of logN(Li) were computed. We found well defined dependences of lithium abundances onTeff,Vsini, and less pronounced for the logg. In case ofVsiniwe see two sequences of stars: with measurable lithium and with the upper limit of logN(Li). About 10% of our targets are known to host planets. Only two SWP have notable lithium abundances, so we found a lower proportion of stars with detectable Li among known planet hosts than among stars without planets. However, given the small sample size of our planet-host sample, our analysis does not show any statistically significant differences in the lithium abundance between SWP and stars without known planets.
