Multisite campaign on the open cluster M67 - I. Observations and photometric reductions

D. Stello, T. Arentoft, T. R. Bedding, M. Y. Bouzid, H. Bruntt, Z. Csubry, T. H. Dall, Z. E. Dind, S. Frandsen, R. L. Gilliland, A. P. Jacob, H. R. Jensen, Y. B. Kang, S. L. Kim, L. L. Kiss, H. Kjeldsen, J. R. Koo, J. A. Lee, C. U. Lee, J. NusplC. Sterken, R. Szabó

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10 Citations (Scopus)

Abstract

We report on an ambitious multisite campaign aimed at detecting stellar variability, particularly solar-like oscillations, in the red giant stars in the open cluster M67 (NGC 2682). During the six-week observing run, which comprised 164 telescope nights, we used nine 0.6-m to 2.1-m class telescopes located around the world to obtain uninterrupted time series photometry. We outline here the data acquisition and reduction, with emphasis on the optimization of the signal-to-noise ratio of the low-amplitude (50-500 μmag) solar-like oscillations. This includes a new and efficient method for obtaining the linearity profile of the CCD response at ultrahigh precision (∼10 parts per million). The noise in the final time series is 0.50 mmag per minute integration for the best site, while the noise in the Fourier spectrum of all sites combined is 20 μmag. In addition to the red giant stars, this data set proves to be very valuable for studying high-amplitude variable stars such as eclipsing binaries, W UMa systems and δ Scuti stars.

Original languageEnglish
Pages (from-to)1141-1150
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume373
Issue number3
DOIs
Publication statusPublished - Dec 1 2006

Keywords

  • Blue stragglers
  • Open clusters and associations: individual: M67 (NGC 2682)
  • Stars: oscillations
  • Stars: variables: other
  • Techniques: photometric
  • δ Scuti

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Stello, D., Arentoft, T., Bedding, T. R., Bouzid, M. Y., Bruntt, H., Csubry, Z., Dall, T. H., Dind, Z. E., Frandsen, S., Gilliland, R. L., Jacob, A. P., Jensen, H. R., Kang, Y. B., Kim, S. L., Kiss, L. L., Kjeldsen, H., Koo, J. R., Lee, J. A., Lee, C. U., ... Szabó, R. (2006). Multisite campaign on the open cluster M67 - I. Observations and photometric reductions. Monthly Notices of the Royal Astronomical Society, 373(3), 1141-1150. https://doi.org/10.1111/j.1365-2966.2006.11060.x