Niemczura, E, Murphy, SJ, Smalley, B, Uytterhoeven, K, Pigulski, A, Lehmann, H, Bowman, DM, Catanzaro, G, van Aarle, E, Bloemen, S, Briquet, M, De Cat, P, Drobek, D, Eyer, L, Gameiro, JFS, Gorlova, N, Kaminski, K, Lampens, P, Marcos-Arenal, P, Papics, PI, Vandenbussche, B, Van Winckel, H, Steslicki, M and Fagas, M (2015) Spectroscopic survey of Kepler stars.(a similar to...) I. HERMES/Mercator observations of A- and F-type stars. Monthly Notices of the Royal Astronomical Society, 450 (3). 2764 -2783. ISSN 1365-2966

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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 modeling 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 compared with those from the Kepler Input Catalogue (KIC), confirming that the KIC effective temperatures are underestimated for A stars. Effective temperatures calculated by spectral energy distribution fitting are in good agreement with those determined from the spectral line analysis. The analysed sample comprises stars with approximately solar chemical abundances, as well as chemically peculiar stars of the Am, Ap, and λ Boo types. The distribution of the projected rotational velocity, vsin i, is typical for A and F stars and ranges from 8 to about 280 km s−1, with a mean of 134 km s−1.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: stars, abundances, chemically peculiar, rotation
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 14 Jul 2015 14:07
Last Modified: 25 Apr 2019 09:34

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