![]() ![]() ![]() With such mass and a difference in effective temperature of 600 K from spectroscopy, the secondary and primary are, respectively, in the early and advanced stage of the first dredge-up event on the red-giant branch. ![]() From seismology the primary of KIC 9163796 is a star of 1.39 ± 0.06 M ⊙, while the spectroscopic mass ratio between both components can be determined with much higher precision by spectral disentangling to be 1.015 ± 0.005. From representative theoretical models of the star, we derived the internal rotational gradient, while for a grid of models, the measured lithium abundance is compared with theoretical predictions. The surface rotation period of the primary is determined from the Kepler light curve. Mass and radius of the primary were determined through asteroseismology. The effective temperatures, and metallicities were extracted from disentangled spectra of the two stars. The orbital elements and the spectra of both components were determined using spectral disentangling methods. We analysed four years of Kepler space photometry and we obtained high-resolution spectroscopy with the Hermes instrument. In this work, we aim to study the eccentric binary system KIC 9163796, whose two components are very close in mass and both are low-luminosity red-giant stars. The mass ratio can be determined with much higher accuracy than the actual stellar mass.Īim. The observed differences are determined by the difference in stellar mass between the two components. Differences of parameters, such as age or initial conditions, which otherwise would have strong impact on the stellar evolution, can be neglected. Binaries in double-lined spectroscopic systems (SB2) provide a homogeneous set of stars. Harvard-Smithsonian Center for Astrophysics,ĭepartamento de Física, Universidade Federal do Rio Grande do Norte,Ĭontext. de Paris, PSL Research Univ., CNRS, Univ. LUPM, UMR5299, Université de Montpellier, CNRS, ![]() Institut für Astronomie der Universität Wien,ĭepartment of Physics, Faculty of Science, University of Zagreb, Université Paris Diderot, AIM, Sorbonne Paris Cité, CEA, CNRS, Raskin 8Į-mail: de Astrofísica, Universidad de La Laguna, Astronomical objects: linking to databases.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes ![]()
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