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

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 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.

15 pages, 12 figures, published in ApJS, 2020 May 12

References in corpus (25)

• The Transiting Exoplanet Survey Satellite
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The James Webb Space Telescope
• galpy: A Python Library for Galactic Dynamics
• alpha-, r-, and s-process element trends in the Galactic thin and thick disks
• A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars
• The Milky Way's circular velocity curve between 4 and 14 kpc from APOGEE data
• Can we constrain interior structure of rocky exoplanets from mass and radius measurements?
• CH in stellar atmospheres: an extensive linelist
• DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
• Precise radial velocities of giant stars. III. Spectroscopic stellar parameters
• The Gaia-ESO Survey: the Galactic Thick to Thin Disc transition
• Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
• Line lists for the A2PI-X2Sigma+ (red) and {B2Sigma+-X2Sigma} (violet) Systems of CN, 13C14N, and 12C15N, and Application to Astronomical Spectra
• Abundances in the Local Region II: F, G and K Dwarfs and Subgiants
• Atomic and Molecular Data for Optical Stellar Spectroscopy
• The Gaia-ESO Survey: the chemical structure of the Galactic discs from the first internal data release
• Displacement of the Sun from the Galactic Plane
• Constraining planet structure and composition from stellar chemistry: trends in different stellar populations
• Influence of sub- and super-solar metallicities on the compositions of solid planetary building blocks
• The lithium abundances for a large sample of red giants
• A Unified tool to estimate Distances, Ages and Masses (UniDAM) from spectrophotometric data
• High-resolution Spectroscopic Study of Dwarf Stars in the Northern Sky: Lithium, Carbon, and Oxygen Abundances
• Carbon and Oxygen abundances across the Hertzsprung gap
• Spectroscopy of Dwarf Stars Around the North Celestial Pole

Cited by in corpus (2)

• Full Spectroscopic Model and Trihybrid Experimental-Perturbative-Variational Line List for CN
• Chemical Composition Of Bright Stars In The Northern Hemisphere: Star-Planet Connection