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


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



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 ? 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.

Acceptance Date May 18, 2017
Publication Date Sep 21, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Pages 2870 -2889
Keywords stars, abundances, chemically peculiar, general, rotation
Publisher URL


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