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26 April 2024 |
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Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars | | E. Niemczura
; S. J. Murphy
; B. Smalley
; K. Uytterhoeven
; A. Pigulski
; H. Lehmann
; D. M. Bowman
; G. Catanzaro
; E. van Aarle
; S. Bloemen
; M. Briquet
; P. De Cat
; D. Drobek
; L. Eyer
; J. F. S. Gameiro
; N. Gorlova
; K. Kaminski
; P. Lampens
; P. Marcos-Arenal
; P. I. Papics
; B. Vandenbussche
; H. Van Winckel
; M. Steslicki
; M. Fagas
; | | Date: |
12 Mar 2015 | | 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 modelling 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 Lambda Boo types. The distribution of the projected
rotational velocity, Vsini, is typical for A and F stars and ranges from 8 to
about 280 km/s, with a mean of 134 km/s. | | Source: | arXiv, 1503.3675 | | Services: | Forum | Review | PDF | Favorites | |
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