Chemical Composition of Bright Stars in the Continuous Viewing Zone of the TESS Space Mission

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  • G. Tautvaišienė, Vilnius University
  • ,
  • S. Mikolaitis, Vilnius University
  • ,
  • A. Drazdauskas, Vilnius University
  • ,
  • E. Stonkutė, Vilnius University
  • ,
  • R. Minkevičiūtė, Vilnius University
  • ,
  • H. Kjeldsen
  • K. Brogaard
  • C. Von Essen
  • F. Grundahl
  • E. Pakštienė, Vilnius University
  • ,
  • V. Bagdonas, Vilnius University
  • ,
  • C. Viscasillas Vázquez, Vilnius University

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(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.

Original languageEnglish
Article number19
JournalAstrophysical Journal, Supplement Series
Number of pages11
Publication statusPublished - May 2020

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