Cepheid investigations using the Kepler space telescope

Details Cepheid investigations using the Kepler space telescope Cepheid investigations using the Kepler space telescope

2011-01-12

arxiv.org/abs/1101.2443v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 15 figures, accepted for publication in MNRAS, electronic-only tables are available upon request from the first auth

Scientific paper

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 databases. The analysis of the first 322 days of Kepler photometry, and recent ground-based follow-up multicolour photometry and spectroscopy allowed us to confirm that one of these stars, V1154 Cyg (KIC 7548061), 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 ultra-precise, nearly uninterrupted Kepler photometry for nonradial 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.

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