ASTEROSEISMOLOGY OF THE OPEN CLUSTERS NGC 6791, NGC 6811, AND NGC 6819 FROM 19 MONTHS OF KEPLER PHOTOMETRY

ASTEROSEISMOLOGY OF THE OPEN CLUSTERS NGC 6791, NGC 6811, AND NGC 6819 FROM 19 MONTHS OF KEPLER PHOTOMETRY

We studied solar-like oscillations in 115 red giants in the three open clusters, NGC 6791, NGC 6811, and NGC 6819, based on photometric data covering more than 19 months with NASA's Kepler space telescope. We present the asteroseismic diagrams of the asymptotic parameters [delta]v sub(02), [del...

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Bibliographic Details
Published in:The Astrophysical journal 2012-10, Vol.757 (2), p.1-13
Main Authors: Corsaro, Enrico, STELLO, DENNIS, Huber, Daniel, Bedding, Timothy R, Bonanno, Alfio, Brogaard, Karsten, Kallinger, Thomas, BENOMAR, OTHMAN, White, Timothy R, Mosser, Benoit
Format: Article
Language:eng
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Asymptotic properties
ASYMPTOTIC SOLUTIONS
Clumps
Clusters
COLOR
Combustion
COMPUTERIZED SIMULATION
CORRELATIONS
DIPOLES
GALAXY CLUSTERS
HELIUM BURNING
LINE WIDTHS
MASS
Mathematical models
NASA
Open clusters
OSCILLATIONS
PHOTOMETRY
Physics
RED GIANT STARS
SEISMOLOGY
STAR EVOLUTION
TELESCOPES
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Summary:We studied solar-like oscillations in 115 red giants in the three open clusters, NGC 6791, NGC 6811, and NGC 6819, based on photometric data covering more than 19 months with NASA's Kepler space telescope. We present the asteroseismic diagrams of the asymptotic parameters [delta]v sub(02), [delta]v sub(01), and member of , which show clear correlation with fundamental stellar parameters such as mass and radius. When the stellar populations from the clusters are compared, we see evidence for a difference in mass of the red giant branch stars and possibly a difference in structure of the red clump stars, from our measurements of the small separations [delta]v sub(02) and [delta]v sub(01). Ensemble echelle diagrams and upper limits to the linewidths of l = 0 modes as a function of [Delta]v of the clusters NGC 6791 and NGC 6819 are also shown, together with the correlation between the l = 0 ridge width and the T sub(eff) of the stars. Lastly, we distinguish between red giant branch and red clump stars through the measurement of the period spacing of mixed dipole modes in 53 stars among all the three clusters to verify the stellar classification from the color-magnitude diagram. These seismic results also allow us to identify a number of special cases, including evolved blue stragglers and binaries, as well as stars in late He-core burning phases, which can be potentially interesting targets for detailed theoretical modeling.
ISSN:0004-637X
1538-4357