Chemical Composition of Bright Stars in the Continuous Viewing Zone of the TESS Space Mission
G. Tautvaišienė, Š. Mikolaitis, A. Drazdauskas, E. Stonkutė, R. Minkevičiūtė, H. Kjeldsen, K. Brogaard, C. von Essen, F. Grundahl, E. Pakštienė, V. Bagdonas, C. Viscasillas Vázquez
Abstract
Abstract 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 Molėtai 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(C 2 ), 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.