Seismic probing of the first dredge-up event through the eccentric red-giant & red-giant spectroscopic binary KIC9163796
P. G. Beck, T. Kallinger, K. Pavlovski, A. Palacios, A. Tkachenko, S., Mathis, R. A. Garcia, E. Corsaro, C. Johnston, B. Mosser, T. Ceillier, J.-D., do Nascimento Jr., G. Raskin

TL;DR
This study uses a combination of asteroseismology, spectroscopy, and modeling to investigate the internal structure and evolutionary stage of a rare eccentric red-giant binary system, providing insights into stellar rotation and mixing processes.
Contribution
It presents a detailed analysis of the binary system KIC9163796, combining observational data and models to study internal rotation, lithium abundance, and the first dredge-up event in red giants.
Findings
Mass and radius of primary determined via asteroseismology.
Surface rotation closely matches orbital period, indicating quasi-rigid rotation.
Measured internal rotational gradient and lithium abundance are consistent with models.
Abstract
Binaries in double-lined spectroscopic systems provide a homogeneous set of stars. Differences of parameters, such as age or initial conditions, which otherwise would have strong impact on the stellar evolution, can be neglected. The observed differences are determined by the difference in stellar mass between the two components. The mass ratio can be determined with much higher accuracy than the actual stellar mass. In this work, we aim to study the eccentric binary system KIC9163796, whose two components are very close in mass and both are low-luminosity red-giant stars from four years of Kepler space photometry and high-resolution spectroscopy with Hermes. Mass and radius of the primary were determined through asteroseismology to be 1.39+/-0.06 Mo and 5.35+/-0.09 Ro, resp. From spectral disentangling the mass ratio was found to be 1.015+/-0.005 and that the secondary is ~600K hotter…
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