Stellar atmospheric parameters of FGK-type stars from high-resolution optical and near-infrared CARMENES spectra

Abstract

With the purpose of assessing classic spectroscopic methods on high-resolution and high signal-to-noise ratio spectra in the near-infrared wavelength region, we selected a sample of 65 F-, G-, and K-type stars observed with CARMENES, the new, ultra-stable, double-channel spectrograph at the 3.5 m Calar Alto telescope. We computed their stellar atmospheric parameters ($T_{\mathrm{eff}}$, $\log g$, $\xi$, and [Fe/H]) by means of the StePar code, a Python implementation of the equivalent width method that employs the 2017 version of the MOOG code and a grid of MARCS model atmospheres. We compiled four Fe I and Fe II line lists suited to metal-rich dwarfs, metal-poor dwarfs, metal-rich giants, and metal-poor giants that cover the wavelength range from 5300 to 17100 angstroms, thus substantially increasing the number of identified Fe I and Fe II lines up to 653 and 23, respectively. We examined the impact of the near-infrared Fe I and Fe II lines upon our parameter determinations after an exhaustive literature search, placing special emphasis on the 14 $Gaia$ benchmark stars contained in our sample. Even though our parameter determinations remain in good agreement with the literature values, the increase in the number of Fe I and Fe II lines when the near-infrared region is taken into account reveals a deeper $T_{\mathrm{eff}}$ scale that might stem from a higher sensitivity of the near-infrared lines to $T_{\mathrm{eff}}$.

References in corpus (27)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Astrophysics Source Code Library
• The Radial Velocity Experiment (RAVE): first data release
• The GALAH Survey: Scientific Motivation
• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
• Basic physical parameters of a selected sample of evolved stars
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• Pulkovo Compilation of Radial Velocities for 35495 Hipparcos Stars in a Common System
• A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)
• Modern stellar spectroscopy caveats
• Precise radial velocities of giant stars. III. Spectroscopic stellar parameters
• The CARMENES search for exoplanets around M dwarfs: Different roads to radii and masses of the target stars
• Both accurate and precise gf-values for FeII lines
• APOGEE: The Apache Point Observatory Galactic Evolution Experiment
• Disentangling the Galactic Halo with APOGEE: I. Chemical and Kinematical Investigation of Distinct Metal-Poor Populations
• New H-band Stellar Spectral Libraries for the SDSS-III/APOGEE survey
• Stellar parameters and chemical abundances of 223 evolved stars with and without planets
• SPIRou: the near-infrared spectropolarimeter/high-precision velocimeter for the Canada-France-Hawaii telescope
• A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
• Determining stellar parameters of asteroseismic targets: going beyond the use of scaling relations
• On the origin of stars with and without planets. Tc trends and clues to Galactic evolution
• The CARMENES search for exoplanets around M dwarfs -- Photospheric parameters of target stars from high-resolution spectroscopy. II. Simultaneous multiwavelength range modeling of activity insensitive lines
• Atmospheric parameters and chemical properties of red giants in the CoRoT asteroseismology fields
• Lithium abundance in atmospheres of F- and G-type supergiants and bright giants
• Characterizing the AB Doradus Moving Group Via High Resolution Spectroscopy and Kinematic Traceback
• CRIRES-POP: a library of high resolution spectra from 1 to 5 microns II. Data reduction and the spectrum of the K giant 10 Leo

Cited by in corpus (11)

• The CARMENES search for exoplanets around M dwarfs. Guaranteed time observations Data Release 1 (2016-2020)
• MPS-ATLAS: A fast all-in-one code for synthesising stellar spectra
• The GAPS Programme at TNG -- XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
• Confirmation of an He I evaporating atmosphere around the 650-Myr-old sub-Neptune HD235088 b (TOI-1430 b) with CARMENES
• The CARMENES search for exoplanets around M dwarfs. Telluric absorption corrected high S/N optical and near-infrared template spectra of 382 M dwarf stars
• Ariel stellar characterisation II. Chemical abundances of carbon, nitrogen, and oxygen for 181 planet-host FGK dwarf stars
• Line-depth ratios as indicators of effective temperature and surface gravity
• Revisiting the Red-giant Branch Hosts KOI-3886 and $\iota$ Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
• The CARMENES search for exoplanets around M dwarfs. Variability of the He I line at 10830 Å
• Gaia FGK Benchmark Stars: Selecting Infrared Lines for Abundance Determination
• Metallicities in M dwarfs: Investigating different determination techniques