  Accurate atmospheric parameters and chemical composition of stars play a
vital role in characterizing physical parameters of exoplanetary systems and
understanding of their formation. A full asteroseismic characterization of a
star is also possible if its main atmospheric parameters are known. The NASA
Transiting Exoplanet Survey Satellite (TESS) space telescope will play a very
important role in searching of exoplanets around bright stars and stellar
asteroseismic variability research. We have observed all 302 bright (V < 8 mag)
and cooler than F5 spectral class stars in the northern TESS continuous viewing
zone with a 1.65 m telescope at the Moletai Astronomical Observatory of Vilnius
University and the high-resolution Vilnius University Echelle Spectrograph. We
uniformly determined the main atmospheric parameters, ages, orbital parameters,
velocity components, and precise abundances of 24 chemical species ( C(C2),
N(CN), [O I], Na I, Mg I, Al I, Si I, Si II, Ca I, Ca II, Sc I, Sc II, Ti I, Ti
II, V I, Cr I, Cr II, Mn I, Fe I, Fe II, Co I, Ni I, Cu I, and Zn I) for 277
slowly rotating single stars in the field. About 83 % of the sample stars
exhibit the Mg/Si ratios greater than 1.0 and may potentially harbor rocky
planets in their systems.
