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Constraining mixing processes in 16CygA using Kepler data and seismic inversion techniques
Buldgen, Gaël; Dupret, Marc-Antoine; Reese, Daniel Roy
2015The KASC8/TASC1 Workshop: Space Asteroseismology: the next generation
 

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Keywords :
Asteroseismology; Inversion techniques; Stars: fundamental parameters
Abstract :
[en] Constraining additional mixing processes is a central problem in stellar physics. Indeed, their impact on determined stellar ages is non-negligible and thus strongly affects our studies of stellar evolution, galactic history, and exoplanetary systems. However, the quality of the Kepler data allows us to use new seismic tools to constrain these processes. In this talk, we will show a particularly efficient method for constraining chemical mixing in stellar interiors using custom-made structural integrated quantities. These quantities are designed to probe particular regions of the stellar interior and are estimated via the SOLA inversion method (Pijpers and Thompson 1994). They help us determine the values of parameters describing extra mixing processes. Inversions of such quantities have been originally described for the mean density in Reese et al. (2012) and have been extended to the acoustic radius and a first indicator of core conditions in Buldgen et al. (2015). A more efficient indicator for core conditions has now been derived and successfully tested using test cases similar to the 16Cyg binary system (Buldgen et al. in prep.). In this talk, we will show how our technique applies to the system 16Cyg and constrains additional mixing processes using the above structural indicators. Additional indicators and further studies will lead to seismically constrained chemical profiles for stars observed by Kepler, thereby helping us to disentangle the problem of additional mixing processes and ultimately to provide better stellar ages.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Buldgen, Gaël ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Dupret, Marc-Antoine ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Reese, Daniel Roy;  University of Birmingham > School of Physics and Astronomy
Language :
English
Title :
Constraining mixing processes in 16CygA using Kepler data and seismic inversion techniques
Publication date :
2015
Event name :
The KASC8/TASC1 Workshop: Space Asteroseismology: the next generation
Event date :
du 15 juin 2015 au 19 juin 2015
Audience :
International
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
Available on ORBi :
since 17 August 2015

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