TY - JOUR
T1 - Asteroseismic Diagrams From a Survey of Solar-Like Oscillations With Kepler
AU - Broomhall, Anne-Marie
AU - Chaplin, William
AU - Elsworth, Yvonne
AU - Verner, Graham
PY - 2011/11/1
Y1 - 2011/11/1
N2 - Photometric observations made by the NASA Kepler Mission have led to a dramatic increase in the number of main-sequence and subgiant stars with detected solar-like oscillations. We present an ensemble asteroseismic analysis of 76 solar-type stars. Using frequencies determined from the Kepler time-series photometry, we have measured three asteroseismic parameters that characterize the oscillations: the large frequency separation (Delta nu), the small frequency separation between modes of l = 0 and l = 2 (delta nu(02)), and the dimensionless offset (epsilon). These measurements allow us to construct asteroseismic diagrams, namely the so-called Christensen-Dalsgaard diagram of delta nu(02) versus Delta nu, and the recently re-introduced epsilon diagram. We compare the Kepler results with previously observed solar-type stars and with theoretical models. The positions of stars in these diagrams places constraints on their masses and ages. Additionally, we confirm the observational relationship between epsilon and T-eff that allows for the unambiguous determination of radial order and should help resolve the problem of mode identification in F stars.
AB - Photometric observations made by the NASA Kepler Mission have led to a dramatic increase in the number of main-sequence and subgiant stars with detected solar-like oscillations. We present an ensemble asteroseismic analysis of 76 solar-type stars. Using frequencies determined from the Kepler time-series photometry, we have measured three asteroseismic parameters that characterize the oscillations: the large frequency separation (Delta nu), the small frequency separation between modes of l = 0 and l = 2 (delta nu(02)), and the dimensionless offset (epsilon). These measurements allow us to construct asteroseismic diagrams, namely the so-called Christensen-Dalsgaard diagram of delta nu(02) versus Delta nu, and the recently re-introduced epsilon diagram. We compare the Kepler results with previously observed solar-type stars and with theoretical models. The positions of stars in these diagrams places constraints on their masses and ages. Additionally, we confirm the observational relationship between epsilon and T-eff that allows for the unambiguous determination of radial order and should help resolve the problem of mode identification in F stars.
KW - stars: oscillations
U2 - 10.1088/2041-8205/742/1/L3
DO - 10.1088/2041-8205/742/1/L3
M3 - Article
SN - 2041-8205
VL - 742
SP - L3
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
ER -