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arxiv: 1701.03365 · v1 · pith:AGY36INWnew · submitted 2017-01-12 · 🌌 astro-ph.SR

First Results From The Hertzsprung Song Telescope: Asteroseismology Of The G5 Subgiant Star {Mu}Her

F. Grundahl , M. Fredslund Andersen , J. Christensen-Dalsgaard , V. Antoci , H. Kjeldsen , R. Handberg , G. Houdek , T. R. Bedding
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P. L. Pall\'e J. Jessen-Hansen V. Silva Aguirre T. R. White S. Frandsen S. Albrecht M. I. Andersen T. Arentoft K. Brogaard W. J. Chaplin K. Harps{\o}e U.G. J{\o}rgensen I. Karovicova C. Karoff P. Kj{\ae}rgaard Rasmussen M. N. Lund M. Sloth Lundkvist J. Skottfelt A. Norup S{\o}rensen R. Tronsgaard E. Weiss
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classification 🌌 astro-ph.SR
keywords modesdatadeterminefirsthertzsprungobservedobtainedoscillation
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We report the first asteroseismic results obtained with the Hertzsprung SONG Telescope from an extensive high-precision radial-velocity observing campaign of the subgiant muHerculis. The data set was collected during 215 nights in 2014 and 2015. We detected a total of 49 oscillation modes with l values from 0 to 3, 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 degrees. 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 1.15M_sun and an age of 7.8+/-0.4 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.

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