Bibcode
Grundahl, F.; Fredslund Andersen, M.; Christensen-Dalsgaard, J.; Antoci, V.; Kjeldsen, H.; Handberg, R.; Houdek, G.; Bedding, T. R.; Pallé, P. L.; Jessen-Hansen, J.; Silva Aguirre, V.; White, T. R.; Frandsen, S.; Albrecht, S.; Andersen, M. I.; Arentoft, T.; Brogaard, K.; Chaplin, W. J.; Harpsøe, K.; Jørgensen, U. G.; Karovicova, I.; Karoff, C.; Kjærgaard Rasmussen, P.; Lund, M. N.; Sloth Lundkvist, M.; Skottfelt, J.; Norup Sørensen, A.; Tronsgaard, R.; Weiss, E.
Bibliographical reference
The Astrophysical Journal, Volume 836, Issue 1, article id. 142, 12 pp. (2017).
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2017
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Citations
74
Refereed citations
65
Description
We report the first asteroseismic results obtained with the Hertzsprung
Stellar Observations Network Group Telescope from an extensive
high-precision radial-velocity observing campaign of the subgiant μ
Herculis. The data set was collected during 215 nights in 2014 and 2015.
We detected a total of 49 oscillation modes with l values from zero to
three, including some l = 1 mixed modes. Based on the rotational
splitting observed in l = 1 modes, we determine a rotational period of
52 days and a stellar inclination angle of 63°. The parameters
obtained through modeling of the observed oscillation frequencies agree
very well with independent observations and imply a stellar mass between
1.11 and 1.15 M ⊙ and an age of
{7.8}-0.4+0.3 Gyr. Furthermore, the high-quality
data allowed us to determine the acoustic depths of the He ii ionization
layer and the base of the convection zone.
Based on observations made with the Hertzsprung SONG telescope operated
on the Spanish Observatorio del Teide on the island of Tenerife by the
Aarhus and Copenhagen Universities and by the Instituto de
Astrofísica de Canarias.
Related projects
Helio and Astero-Seismology and Exoplanets Search
The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary
Savita
Mathur