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

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DOI

    E. Niemczura, Univ Wroclaw, University of Wroclaw, Astron Inst, M. Polinska, Adam Mickiewicz University,
  • S. J. Murphy
  • B. Smalley, Keele University, Z. Kolaczkowski, Univ Wroclaw, University of Wroclaw, Astron Inst,
  • J. Jessen-Hansen
  • K. Uytterhoeven, Universidad de La Laguna, J. M. Lykke, Ctr Star & Planet Format, Geol Museum, Niels Bohr Inst., University of Copenhagen, Copenhagen Univ, Niels Bohr Institute, Copenhagen University Hospital, Copenhagen, Nat Hist Museum Denmark, Ctr Excellence GeoGenet, A. Trivino Hage, Universidad de La Laguna, G. Michalska, Univ Wroclaw, University of Wroclaw, Astron Inst

We have analysed high-resolution spectra of 28 A and 22 F stars in the Kepler field, observed using the Fibre-Fed Echelle 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.

Original languageEnglish
JournalRoyal Astronomical Society. Monthly Notices
Volume470
Issue number3
Pages (from-to)2870-2889
Number of pages20
ISSN0035-8711
DOIs
StatePublished - Sep 2017

    Research areas

  • stars: abundances, stars: chemically peculiar, stars: general, stars: rotation, A-TYPE STARS, MAIN-SEQUENCE STARS, TO-CORE ROTATION, POLE-ON STAR, CHEMICAL-COMPOSITION, OPEN CLUSTER, ATMOSPHERIC PARAMETERS, ASTEROSEISMIC MEASUREMENT, STELLAR CLASSIFICATION, RADIAL-VELOCITIES

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