Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars
E. Niemczura, S. J. Murphy, B. Smalley, K. Uytterhoeven, A. Pigulski,, H. Lehmann, D. M. Bowman, G. Catanzaro, E. van Aarle, S. Bloemen, M. Briquet,, P. De Cat, D. Drobek, L. Eyer, J. F. S. Gameiro, N. Gorlova, K. Kaminski, P., Lampens, P. Marcos-Arenal, P. I. Papics

TL;DR
This study provides detailed spectroscopic parameters for 117 Kepler A- and F-type stars, improving the accuracy of stellar data essential for asteroseismic modeling and revealing discrepancies in catalog temperatures.
Contribution
First high-resolution spectroscopic analysis of Kepler A- and F-type stars, offering refined stellar parameters and chemical abundances to support asteroseismology.
Findings
KIC effective temperatures are underestimated for A stars.
Spectral energy distribution fitting agrees well with spectral line analysis.
Sample includes chemically peculiar stars and typical rotational velocities.
Abstract
The Kepler space mission provided near-continuous and high-precision photometry of about 207,000 stars, which can be used for asteroseismology. However, for successful seismic modelling it is equally important to have accurate stellar physical parameters. Therefore, supplementary ground-based data are needed. We report the results of the analysis of high-resolution spectroscopic data of A- and F-type stars from the Kepler field, which were obtained with the HERMES spectrograph on the Mercator telescope. We determined spectral types, atmospheric parameters and chemical abundances for a sample of 117 stars. Hydrogen Balmer, Fe I, and Fe II lines were used to derive effective temperatures, surface gravities, and microturbulent velocities. We determined chemical abundances and projected rotational velocities using a spectrum synthesis technique. The atmospheric parameters obtained were…
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