Journal Article

<i>Kepler</i> observations of Am stars*

L. A. Balona, V. Ripepi, G. Catanzaro, D. W. Kurtz, B. Smalley, P. De Cat, L. Eyer, A. Grigahcène, S. Leccia, J. Southworth, K. Uytterhoeven, H. Van Winckel, J. Christensen-Dalsgaard, H. Kjeldsen, D. A. Caldwell, J. Van Cleve and F. R. Girouard

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 1, pages 792-800
Published in print June 2011 | ISSN: 0035-8711
Published online June 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18454.x
Kepler observations of Am stars*

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We present an analysis of high-resolution spectra for two pulsating Am stars in the Kepler field. The stellar parameters derived in this way are important because parameters derived from narrow-band photometry may be affected by the strong metal lines in these stars. We analyse the Kepler time series of ten known Am stars and find that six of them clearly show δ Scuti pulsations. The other four appear to be non-pulsating. We derive fundamental parameters for all known pulsating Am stars from ground-based observations and also for the Kepler Am stars to investigate the location of the instability strip for pulsating Am stars. We find that there is not much difference between the Am-star instability strip and the δ Scuti instability strip. We find that the observed location of pulsating Am stars in the HR diagram does not agree with the location predicted from diffusion calculations.

Keywords: stars: chemically peculiar; stars: fundamental parameters; stars: oscillations; stars: variables: δ Scuti

Journal Article.  6037 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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