Butterfly diagram of a Sun-like star observed using asteroseismology

Michael Bazot, Martin Bo Nielsen, D. Mary, J. Christensen-Dalsgaard, Othman Benomar, P. Petit, Laurent Gizon, Katepalli Sreenivasan, T. R. White

Research output: Contribution to journalArticle

Abstract

Stellar magnetic fields are poorly understood, but are known to be important for stellar evolution and exoplanet habitability. They drive stellar activity, which is the main observational constraint on theoretical models for magnetic field generation and evolution. Starspots are the main manifestation of the magnetic fields at the stellar surface. In this study we measured the variation in their latitude with time, called a butterfly diagram in the solar case, for the solar analogue HD 173701 (KIC 8006161). To this end, we used Kepler data to combine starspot rotation rates at different epochs and the asteroseismically determined latitudinal variation in the stellar rotation rates. We observe a clear variation in the latitude of the starspots. It is the first time such a diagram has been constructed using asteroseismic data.

Original languageEnglish (US)
Article numberL9
JournalAstronomy and Astrophysics
Volume619
DOIs
StatePublished - Nov 1 2018

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Keywords

  • Stars: activity
  • Stars: individual: HD173701
  • Stars: oscillations
  • Stars: rotation
  • Stars: solar-type
  • Starspots

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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