Constraining stellar physics from red-giant stars in binaries – stellar rotation, mixing processes and stellar activity

Beck, P. G. and Kallinger, T. and Pavlovski, Krešimir and Palacios, A. and Tkachenko, A. and Garcia, R. A. and Mathis, S. and Corsaro, E. and Johnston, C. and Mosser, B. and Ceillier, T. and do Nascimento Jr., J.-D. and Raskin, G. (2017) Constraining stellar physics from red-giant stars in binaries – stellar rotation, mixing processes and stellar activity. In: Seismology of the Sun and the Distant Stars 2016 – Using Today’s Successes to Prepare the Future – TASC2 & KASC9 Workshop – SPACEINN & HELAS8 Conference. EPJ, Vol. 160, Art. No. 05008, 11-25 July 2016, Açores Islands, Portugal.

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Abstract

The unparalleled photometric data obtained by NASA’s Kepler Space Telescope has led to an improved understanding of stellar structure and evolution - in particular for solar-like oscillators in this context. Binary stars are fascinating objects. Because they were formed together, binary systems provide a set of two stars with very well constrained parameters. Those can be used to study properties and physical processes, such as the stellar rotation, dynamics and rotational mixing of elements and allows us to learn from the differences we find between the two components. In this work, we discussed a detailed study of the binary system KIC 9163796, discovered through Kepler photometry. The ground-based follow-up spectroscopy showed that this system is a double-lined spectroscopic binary, with a mass ratio close to unity. However, the fundamental parameters of the components of this system as well as their lithium abundances differ substantially. Kepler photometry of this system allows to perform a detailed seismic analysis as well as to derive the orbital period and the surface rotation rate of the primary component of the system. Indications of the seismic signature of the secondary are found. The differing parameters are best explained with both components located in the early and the late phase of the first dredge up at the bottom of the red-giant branch. Observed lithium abundances in both components are in good agreement with prediction of stellar models including rotational mixing. By combining observations and theory, a comprehensive picture of the system can be drawn.

Item Type: Conference or Workshop Item (Paper)
Date: 27 October 2017
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 22 Nov 2017 08:27
Last Modified: 22 Nov 2017 08:27
URI: http://digre.pmf.unizg.hr/id/eprint/5724

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