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

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arxiv 1701.03365 v1 pith:AGY36INW 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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Cited by 4 Pith papers

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    Three accelerating stars yield one stellar companion at 166 AU, one 45 Jupiter-mass object at ~18 AU, and one 9.5 Jupiter-mass object at 6.4 AU that is 65% likely to be a planet.

  2. The Pan-Pacific Planet Search -- IX. A menagerie of companions orbiting evolved stars

    astro-ph.EP 2026-05 unverdicted novelty 4.0

    Resolves six speculative companions into one giant planet, one eccentric brown dwarf, two low-mass stars, and two stars with no detectable companions.

  3. The Stellar Observations Network Group (SONG) -- A Legacy Archive of Stellar Time-Domain Spectroscopy

    astro-ph.SR 2026-07 accept novelty 3.5

    The SONG network archive holds >580,000 spectra of 3091 stars (2014–2025) and is presented as an open community resource for asteroseismology, binaries, variability, and exoplanets.

  4. Asteroseismology of solar-type stars

    astro-ph.SR 2019-06 unverdicted novelty 2.0

    This review summarizes the development, techniques, and open questions in asteroseismology of solar-type stars whose oscillations are stochastically excited by surface convection.