Amplitudes of solar-like oscillations: Constraints from red giants in open clusters observed by Kepler

Dennis Stello, Daniel Huber, Thomas Kallinger, Sarbani Basu, Benoît Mosser, Saskia Hekker, Savita Mathur, Rafael A. García, Timothy R. Bedding, Hans Kjeldsen, Ronald L. Gilliland, Graham A. Verner, William J. Chaplin, Othman Benomar, Søren Meibom, Frank Grundahl, Yvonne P. Elsworth, Joanna Molenda-Zakowicz, Robert Szabó, Jørgen Christensen-DalsgaardPeter Tenenbaum, Joseph D. Twicken, Kamal Uddin

Research output: Contribution to journalArticle

Abstract

Scaling relations that link asteroseismic quantities to global stellar properties are important for gaining understanding of the intricate physics that underpins stellar pulsations. The common notion that all stars in an open cluster have essentially the same distance, age, and initial composition implies that the stellar parameters can be measured to much higher precision than what is usually achievable for single stars. This makes clusters ideal for exploring the relation between the mode amplitude of solar-like oscillations and the global stellar properties. We have analyzed data obtained with NASA's Kepler space telescope to study solar-like oscillations in 100 red giant stars located in either of the three open clusters, NGC6791, NGC6819, and NGC6811. By fitting the measured amplitudes to predictions from simple scaling relations that depend on luminosity, mass, and effective temperature, we find that the data cannot be described by any power of the luminosity-to-mass ratio as previously assumed. As a result we provide a new improved empirical relation which treats luminosity and mass separately. This relation turns out to also work remarkably well for main-sequence and subgiant stars. In addition, the measured amplitudes reveal the potential presence of a number of previously unknown unresolved binaries in the red clump in NGC6791 and NGC6819, pointing to an interesting new application for asteroseismology as a probe into the formation history of open clusters.

Original languageEnglish (US)
Article numberL10
JournalAstrophysical Journal Letters
Volume737
Issue number1
DOIs
StatePublished - Aug 10 2011

Keywords

  • binaries: general
  • open clusters and associations: individual (NGC 6791, NGC 6819, NGC 6811)
  • stars: interiors
  • stars: oscillations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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