The surface rotation of the primary is determined from Models, the measured difference in lithium abundance is compared with The primary, we derived the internal rotational gradient. The first dredge-up event on the red-giant branch. From spectral disentangling the mass ratio was found toīe 1.015+/-0.005 and that the secondary is ~600K hotter than the primary.Įvolutionary models place both components, in the early and advanced stage of Primary were determined through asteroseismology to be 1.39+/-0.06 Mo andĥ.35+/-0.09 Ro, resp. Photometry and high-resolution spectroscopy with Hermes. In this work, we aim to study theĮccentric binary system KIC9163796, whose two components are very close in massĪnd both are low-luminosity red-giant stars from four years of Kepler space The mass ratio can be determined with much higherĪccuracy than the actual stellar mass. The observed differences are determined by the difference in stellar massīetween the two components. Otherwise would have strong impact on the stellar evolution, can be neglected. Differences of parameters, such as age or initial conditions, which Beck and 12 other authors Download PDF Abstract: Binaries in double-lined spectroscopic systems provide a homogeneous set of Download a PDF of the paper titled Seismic probing of the first dredge-up event through the eccentric red-giant & red-giant spectroscopic binary KIC9163796, by P.
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