First results from the Hertzsprung SONG telescope

• Verfasst von: Grundahl, Frank [VerfasserIn]
• Verfasst von: Karovicova, Iva [VerfasserIn]
• Verfasst von: Lundkvist, Mia S. [VerfasserIn]
• Titel: First results from the Hertzsprung SONG telescope
• Titelzusatz: asteroseismology of the G5 subgiant star [mu] Herculis
• Verf.angabe: F. Grundahl, M. Fredslund Andersen, J. Christensen-Dalsgaard, V. Antoci, H. Kjeldsen, R. Handberg, G. Houdek, T.R. Bedding, P.L. Pallé, J. Jessen-Hansen, V. Silva Aguirre, T.R. White, S. Frandsen, S. Albrecht, M.I. Andersen, T. Arentoft, K. Brogaard, W.J. Chaplin, K. Harpsøe, U.G. Jørgensen, I. Karovicova, C. Karoff, P. Kjærgaard Rasmussen, M.N. Lund, M. Sloth Lundkvist, J. Skottfelt, A. Norup Sørensen, R. Tronsgaard, and E. Weiss
• Fussnoten: Im Titel ist mu als griechischer Buchstabe dargestellt ; Gesehen am 25.10.2017
• Titel Quelle: Enthalten in: The astrophysical journal / 1
• Jahr Quelle: 2017
• Band/Heft Quelle: 836(2017,1) Artikel-Nummer 142, 12 Seiten
• ISSN Quelle: 1538-4357
• DOI: doi:10.3847/1538-4357/836/1/142
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564761134

Abstract

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 ##IMG## [http://ej.iop.org/images/0004-637X/836/1/142/apjaa5617ieqn1.gif] $7.8_-0.4^+0.3$ 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.