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

Abstract

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.

arXiv comment17 pages, 15 figures. Accepted for publication in ApJ

References in corpus (52)

• The Transiting Exoplanet Survey Satellite
• Validation of the new Hipparcos reduction
• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
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• Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology
• ADIPLS -- the Aarhus adiabatic oscillation package
• ASTEC -- the Aarhus STellar Evolution Code
• Synthetic Stellar Photometry - I. General considerations and new transformations for broad-band systems
• Stellar Diameters and Temperatures III. Main Sequence A, F, G, & K Stars: Additional high-precision measurements and empirical relations
• Solar-like oscillations in alpha Centauri B
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• Misaligned spin and orbital axes cause the anomalous precession of DI Herculis
• The EBLM Project I-Physical and orbital parameters, including spin-orbit angles, of two low-mass eclipsing binaries on opposite sides of the Brown Dwarf limit
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• The Banana Project. III. Spin-orbit Alignment in the Long-period Eclipsing Binary NY Cephei
• Improvements to Stellar Structure Models, Based on a Grid of 3D Convection Simulations. I. $T(\tau )$-Relations
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• Parallax and masses of alpha Centauri revisited
• Solar-like oscillations and activity in Procyon: A comparison of the 2007 MOST and ground-based radial velocity campaigns
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• NPOI Measurements of Ten Stellar Oscillators
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• A fast and portable Re-Implementation of Piskunov and Valenti's Optimal-Extraction Algorithm with improved Cosmic-Ray Removal and Optimal Sky Subtraction
• Models of $\mu$ Her with asteroseismic constraints
• AME - Asteroseismology Made Easy. Estimating stellar properties by use of scaled models
• Characterization of the Companion to $\mu$ Her
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