Thrusday, July 4 - Session 3 - 15:00

Giant vibrations in dip

T.C. Teixeira1,2, J. Christensen-Dalsgaard2,3, C. Aerts4, F. Carrier5, S. Frandsen2, D. Stello2, F.P. Pijpers3, H. Kjeldsen3, H. Bruntt2
1 Centro de Astrofísica da Universidade do Porto, Portugal
2 Institut for Fysik og Astronomi, Aarhus Universitet, Denmark
3 Theoretical Astrophysics Center, Denmark
4 Catholic University of Leuven, Belgium
5 Geneva Observatory, Switzerland

 

Giants have been fascinating, nearly inscrutable stars for astronomers for many decades, but they've been dying to show their inner self. Now they need not die to reveal their cores, for we have the tool to see right through them: asteroseismology.
Hya is a G7 giant located in an evolutionary track dip in the HR diagram. With the CORALIE spectrograph, sensitive velocity observations were carried out. They resulted in an unprecedented frequency spectrum clearly showing more than a dozen frequencies. These frequencies have been modelled using the JCD evolution & oscillation codes.
In this talk we will present the observations, and discuss the modelling within the parameter space defined by the uncertainties in the observational parameters and by the expectations in theoretical parameters going into the models.

 
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