Cepheid investigations using the Kepler space telescope

R. Szabó, L. Szabados, C. C. Ngeow, R. Smolec, A. Derekas, P. Moskalik, J. Nuspl, H. Lehmann, G. Furész, J. Molenda-Zakowicz, S. T. Bryson, A. A. Henden, D. W. Kurtz, D. Stello, J. M. Nemec, J. M. Benko, L. Berdnikov, H. Bruntt, N. R. Evans, N. A. GorynyaE. N. Pastukhova, R. J. Simcoe, J. E. Grindlay, E. J. Los, A. Doane, S. G. Laycock, D. J. Mink, G. Champine, A. Sliski, G. Handler, L. L. Kiss, Z. Kolláth, J. Kovács, J. Christensen-Dalsgaard, H. Kjeldsen, C. Allen, S. E. Thompson, J. Van Cleve

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

We report results of initial work done on selected candidate Cepheids to be observed with the Kepler space telescope. Prior to the launch, 40 candidates were selected from previous surveys and data bases. The analysis of the first 322d of Kepler photometry, and recent ground-based follow-up multicolour photometry and spectroscopy allowed us to confirm that one of these stars, V1154Cyg (KIC7548061), is indeed a 4.9-d Cepheid. Using the phase lag method, we show that this star pulsates in the fundamental mode. New radial velocity data are consistent with previous measurements, suggesting that a long-period binary component is unlikely. No evidence is seen in the ultraprecise, nearly uninterrupted Kepler photometry for non-radial or stochastically excited modes at the micromagnitude level. The other candidates are not Cepheids, but an interesting mix of possible spotted stars, eclipsing systems and flare stars.

Original languageEnglish
Pages (from-to)2709-2720
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume413
Issue number4
DOIs
StatePublished - Jun 2011

Keywords

  • Stars: individual: V1154 Cygni, KIC 7548061
  • Stars: individual: V2279 Cygni, KIC 8022670
  • Stars: oscillations
  • Stars: variables: Cepheids
  • Techniques: photometric
  • Techniques: spectroscopic

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