Journal Article

Flavours of variability: 29 RR Lyrae stars observed with <i>Kepler</i>

J. M. Benkő, K. Kolenberg, R. Szabó, D. W. Kurtz, S. Bryson, J. Bregman, M. Still, R. Smolec, J. Nuspl, J. M. Nemec, P. Moskalik, G. Kopacki, Z. Kolláth, E. Guggenberger, M. Di Criscienzo, J. Christensen-Dalsgaard, H. Kjeldsen, W. J. Borucki, D. Koch, J. M. Jenkins and J. E. Van Cleve

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 409, issue 4, pages 1585-1593
Published in print December 2010 | ISSN: 0035-8711
Published online December 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17401.x
Flavours of variability: 29 RR Lyrae stars observed with Kepler

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We present our analysis of Kepler observations of 29 RR Lyrae stars, based on 138 d of observation. We report precise pulsation periods for all stars. Nine of these stars had incorrect or unknown periods in the literature. 14 of the stars exhibit both amplitude and phase Blazhko modulations, with Blazhko periods ranging from 27.7 to more than 200 d. For V445 Lyr, a longer secondary variation is also observed in addition to its 53.2-d Blazhko period. The unprecedented precision of the Kepler photometry has led to the discovery of the the smallest modulations detected so far. Moreover, additional frequencies beyond the well-known harmonics and Blazhko multiplets have been found. These frequencies are located around the half-integer multiples of the main pulsation frequency for at least three stars. In four stars, these frequencies are close to the first and/or second overtone modes. The amplitudes of these periodicities seem to vary over the Blazhko cycle. V350 Lyr, a non-Blazhko star in our sample, is the first example of a double-mode RR Lyrae star that pulsates in its fundamental and second overtone modes.

Keywords: stars: oscillations; stars: variables: RR Lyrae

Journal Article.  5357 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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