TY - JOUR
T1 - Sounding open clusters
T2 - Asteroseismic constraints from kepler on the properties of NGC6791 and NGC6819
AU - Basu, Sarbani
AU - Grundahl, Frank
AU - Stello, Dennis
AU - Kallinger, Thomas
AU - Hekker, Saskia
AU - Mosser, Benoit
AU - García, Rafael A.
AU - Mathur, Savita
AU - Brogaard, Karsten
AU - Bruntt, Hans
AU - Chaplin, William J.
AU - Gai, Ning
AU - Elsworth, Yvonne
AU - Esch, Lisa
AU - Ballot, Jerome
AU - Bedding, Timothy R.
AU - Gruberbauer, Michael
AU - Huber, Daniel
AU - Miglio, Andrea
AU - Yildiz, Mutlu
AU - Kjeldsen, Hans
AU - Christensen-Dalsgaard, Jørgen
AU - Gilliland, Ronald L.
AU - Fanelli, Michael M.
AU - Ibrahim, Khadeejah A.
AU - Smith, Jeffrey C.
PY - 2011/3/1
Y1 - 2011/3/1
N2 - We present initial results on some of the properties of open clusters NGC6791 and NGC6819 derived from asteroseismic data obtained by NASA's Kepler mission. In addition to estimating the mass, radius, and log g of stars on the red giant branch (RGB) of these clusters, we estimate the distance to the clusters and their ages. Our model-independent estimate of the distance modulus of NGC6791 is (m - M)0 = 13.11 0.06. We find (m - M)0 = 11.85 0.05 for NGC6819. The average mass of stars on the RGB of NGC6791 is 1.20 0.01 M, while that of NGC6819 is 1.68 0.03 M. It should be noted that we do not have data that cover the entire RGB and the actual mass will be somewhat lower. We have determined model-dependent estimates of ages of these clusters. We find ages between 6.8 and 8.6 Gyr for NGC6791, however, most sets of models give ages around 7 Gyr. We obtain ages between 2 and 2.4 Gyr for NGC6819.
AB - We present initial results on some of the properties of open clusters NGC6791 and NGC6819 derived from asteroseismic data obtained by NASA's Kepler mission. In addition to estimating the mass, radius, and log g of stars on the red giant branch (RGB) of these clusters, we estimate the distance to the clusters and their ages. Our model-independent estimate of the distance modulus of NGC6791 is (m - M)0 = 13.11 0.06. We find (m - M)0 = 11.85 0.05 for NGC6819. The average mass of stars on the RGB of NGC6791 is 1.20 0.01 M, while that of NGC6819 is 1.68 0.03 M. It should be noted that we do not have data that cover the entire RGB and the actual mass will be somewhat lower. We have determined model-dependent estimates of ages of these clusters. We find ages between 6.8 and 8.6 Gyr for NGC6791, however, most sets of models give ages around 7 Gyr. We obtain ages between 2 and 2.4 Gyr for NGC6819.
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U2 - 10.1088/2041-8205/729/1/L10
DO - 10.1088/2041-8205/729/1/L10
M3 - Article
AN - SCOPUS:79953662562
SN - 2041-8205
VL - 729
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1 PART II
M1 - L10
ER -