The Li 6708 Å line in spectra of 17 chemically peculiar and normal A- and F-type stars based on observations at ZTSH in 2014-2015
Within the observation program on studying stellar spectra with the detectable lithium abundance, spectra of 17 stars were obtained in 2014-2015. Observations were carried out with the Pronik - Lagutin echelle spectrograph at the 2.6 m ZTSH telescope (CrAO). The observed group included A- and F-type stars in the range of effective temperatures of 6000-8500 K. As for now, 6 stars with the strongest Li I 6708 Å line have been selected. The method of dispersograms was used for detection of variable details in spectra: for HD 50635, HD 209166, HD 155646, and HD 215648 there were revealed profile variabilities that demonstrate different behavior of the lithium line; for HD 110379 and HD 61064 the variability almost has not been observed. By using synthetic spectra, involving the modified list of atomic data from the VALD database, the lithium abundance was calculated for the Li I 6708 Å line. The estimates are as follows: log ε Li =2.4 ± 0.2 (HD 50635), 2.38 ± 0.10 (HD 215648), 2.85 ± 0.18 (HD 110379), 2.97 ± 0.13 (HD 155646), 3.07 ± 0.11 (HD 209166), 3.35 ± 0.10 (HD 61064).
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