Atmospheric parameters and pulsational properties for a sample of δSct, γDor and hybrid Kepler targets

G. Catanzaro, V. Ripepi, S. Bernabei, M. Marconi, L. Balona, D. W. Kurtz, B. Smalley, W. J. Borucki, H. Bruntt, J. Christensen-Dalsgaard, A. Grigahcène, H. Kjeldsen, D. G. Koch, M. J.P.F.G. Monteiro, J. C. Suárez, R. Szabó, K. Uytterhoeven

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31 Citations (Scopus)

Abstract

We report spectroscopic observations for 19 δSct candidates observed by the Kepler satellite both in long and short cadence mode. For all these stars, by using spectral synthesis, we derive the effective temperature, the surface gravity and the projected rotational velocity. An equivalent spectral-type classification has been also performed for all stars in the sample. These determinations are fundamental for modelling the frequency spectra that will be extracted from the Kepler data for asteroseismic inference. For all the 19 stars, we also present periodograms obtained from Kepler data. We find that all stars show peaks in both low- (γDor; g-mode) and high-frequency (δSct; p-mode) regions. Using the amplitudes and considering 5cyclesd-1 as a boundary frequency, we classified three stars as pure γDor, four as γDor-δ hybrid Sct, five as δSct-γDor hybrid and six as pure δSct. The only exception is the star KIC05296877, which we suggest could be a binary.

Original languageEnglish
Pages (from-to)1167-1176
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume411
Issue number2
DOIs
Publication statusPublished - Feb 1 2011

Keywords

  • Stars: early-type
  • Stars: fundamental parameters
  • Stars: oscillations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Catanzaro, G., Ripepi, V., Bernabei, S., Marconi, M., Balona, L., Kurtz, D. W., Smalley, B., Borucki, W. J., Bruntt, H., Christensen-Dalsgaard, J., Grigahcène, A., Kjeldsen, H., Koch, D. G., Monteiro, M. J. P. F. G., Suárez, J. C., Szabó, R., & Uytterhoeven, K. (2011). Atmospheric parameters and pulsational properties for a sample of δSct, γDor and hybrid Kepler targets. Monthly Notices of the Royal Astronomical Society, 411(2), 1167-1176. https://doi.org/10.1111/j.1365-2966.2010.17749.x