Oscillations in the Sun with SONG: Setting the scale for asteroseismic investigations

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  • Mads Fredslund Andersen
  • Pere Pallé, Instituto de Astrofísica de Canarias, Spain
  • Jens Jessen-Hansen
  • Kun Wang, Qingdao Women & Childrens Hosp, China West Normal University
  • ,
  • Frank Grundahl
  • Timothy R. Bedding , University of Sydney
  • ,
  • T. Roca Cortés, Departamento de Astrofísica, Universidad de La Laguna, E-28207 La Laguna, Tenerife, Spain
  • ,
  • Jie Yu, Univ Sydney, University of Sydney, Sch Phys, Sydney Inst Astron, Sydney University, Sydney, Aarhus Univ, Aarhus University, Dept Phys & Astron, Stellar Astrophys Ctr, Univ Sydney, University of Sydney, Sydney Inst Astron SIfA, Sch Phys
  • ,
  • S Mathur
  • ,
  • Rafael A. García, Université Paris-Saclay, Université Paris—Denis Diderot, France
  • Torben Arentoft
  • C. Régulo, Universidad de La Laguna
  • ,
  • René Tronsgaard Rasmussen, Danmarks Tekniske Universitet
  • ,
  • Hans Kjeldsen
  • Jørgen Christensen-Dalsgaard
Context. We present the first high-cadence multiwavelength radial-velocity observations of the Sun-as-a-star, carried out during 57 consecutive days using the stellar échelle spectrograph at the Hertzsprung SONG Telescope operating at the Teide Observatory.

Aims. Our aim was to produce a high-quality data set and reference values for the global helioseismic parameters νmax, ⊙ and Δν⊙ of the solar p-modes using the SONG instrument. The obtained data set or the inferred values should then be used when the scaling relations are applied to other stars showing solar-like oscillations observed with SONG or similar instruments.

Methods. We used different approaches to analyse the power spectrum of the time series to determine νmax, ⊙: simple Gaussian fitting and heavy smoothing of the power spectrum. We determined Δν⊙ using the method of autocorrelation of the power spectrum. The amplitude per radial mode was determined using the method described in Kjeldsen et al. (2008, ApJ, 682, 1370).

Results. We found the following values for the solar oscillations using the SONG spectrograph: νmax, ⊙ = 3141 ± 12 μHz, Δν⊙ = 134.98 ± 0.04 μHz, and an average amplitude of the strongest radial modes of 16.6 ± 0.4 cm s−1. These values are consistent with previous measurements with other techniques.
Original languageEnglish
Article number9
JournalAstronomy & Astrophysics
Volume623
Number of pages4
ISSN0004-6361
DOIs
Publication statusPublished - 13 Mar 2019

    Research areas

  • Asteroseismology, Sun: oscillations, asteroseismology

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