Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars

Niemczura, E. and Murphy, S. J. and Smalley, B. and Uytterhoeven, K. and Pigulski, A. and Lehmann, H. and Bowman, D. M. and Catanzaro, G. and van Aarle, E. and Bloemen, S. and Briquet, M. and De Cat, P. and Drobek, D. and Eyer, L. and Gameiro, J. F. S. and Gorlova, N. and Kaminski, K. and Lampens, P. and Marcos-Arenal, P. and Papics, P. I. and Vandenbussche, B. and van Winckel, H. and Steslicki, M. and Fagas, M. (2015) Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars. Monthly Notices of the Royal Astronomical Society, 450 (3). pp. 2764-2783. ISSN 0035-8711

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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 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 02 May 2022 22:59
Last Modified: 06 May 2022 02:32
Uncontrolled Keywords: Stars: abundances; Stars: chemically peculiar; Stars: general; Stars: rotation; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stv528
URI: http://eprints.usq.edu.au/id/eprint/47941

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