Spectroscopic survey of Kepler stars – II. FIES/NOT observations of A- and F-type stars

Niemczura, E. and Polinska, M. and Murphy, S. J. and Smalley, B. and Kolaczkowski, Z. and Jessen-Hansen, J. and Uytterhoeven, K. and Lykke, J. M. and Trivino Hage, A. and Michalska, G. (2017) Spectroscopic survey of Kepler stars – II. FIES/NOT observations of A- and F-type stars. Monthly Notices of the Royal Astronomical Society, 470 (3). pp. 2870-2889. ISSN 0035-8711

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Abstract

We have analysed high-resolution spectra of 28 A and 22 F stars in the Kepler field, observed using the Fibre-Fed Échelle Spectrograph at the Nordic Optical Telescope. We provide spectral types, atmospheric parameters and chemical abundances for 50 stars. 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. Effective temperatures calculated by spectral energy distribution fitting are in good agreement with those determined from the spectral line analysis. The stars analysed include chemically peculiar stars of the Am and λ Boo types, as well as stars with approximately solar chemical abundances. The wide distribution of projected rotational velocity, vsin i, is typical for A and F stars. The microturbulence velocities obtained are typical for stars in the observed temperature and surface gravity ranges. Moreover, we affirm the results of Niemczura et al. that Am stars do not have systematically higher microturbulent velocities than normal stars of the same temperature.


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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: 29 Apr 2022 00:58
Last Modified: 16 May 2022 03:10
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/stx1256
URI: http://eprints.usq.edu.au/id/eprint/47942

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