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Mikkel Nørup Lund

The Influence of Metallicity on Stellar Differential Rotation and Magnetic Activity

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  • Christoffer Karoff
  • Travis S. Metcalfe, Space Telescope Sci Inst
  • ,
  • Angela R. G. Santos, Univ Birmingham, University of Birmingham, Sch Phys & Astron
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  • Benjamin T. Montet, Univ Chicago, University of Chicago, Dept Astron & Astrophys
  • ,
  • Howard Isaacson, Univ Calif Berkeley, University of California Berkeley, University of California System, Dept Astron
  • ,
  • Veronika Witzke, Max Planck Inst Sonnensyst Forsch, Max Planck Society
  • ,
  • Alexander I. Shapiro, Max Planck Inst Sonnensyst Forsch, Max Planck Society
  • ,
  • Savita Mathur, Univ La Laguna, Universidad de la Laguna, Dept Astrofis
  • ,
  • Guy R. Davies, Univ Birmingham, University of Birmingham, Sch Phys & Astron
  • ,
  • Mikkel N. Lund
  • Rafael A. Garcia, Univ Paris Diderot, CEA, University of Paris Diderot - Paris VII, Universite Sorbonne Paris Cite-USPC (COMUE), Centre National de la Recherche Scientifique (CNRS), Lab AIM, CEA, DRF,CNRS,IRFU,SAp,Ctr Saclay
  • ,
  • Allan S. Brun, Univ Paris Diderot, CEA, University of Paris Diderot - Paris VII, Universite Sorbonne Paris Cite-USPC (COMUE), Centre National de la Recherche Scientifique (CNRS), Lab AIM, CEA, DRF,CNRS,IRFU,SAp,Ctr Saclay
  • ,
  • David Salabert, Univ Paris Diderot, CEA, University of Paris Diderot - Paris VII, Universite Sorbonne Paris Cite-USPC (COMUE), Centre National de la Recherche Scientifique (CNRS), Lab AIM, CEA, DRF,CNRS,IRFU,SAp,Ctr Saclay
  • ,
  • Pedro P. Avelino, Univ Porto, Universidade do Porto, Dept Fis & Astron, Fac Ciencias
  • ,
  • Jennifer van Saders, Observ Carnegie Inst Washington, Carnegie Institution for Science
  • ,
  • Ricky Egeland, Natl Ctr Atmospher Res, National Center Atmospheric Research (NCAR) - USA, High Altitude Observ
  • ,
  • Margarida S. Cunha, Univ Porto, Universidade do Porto, Dept Fis & Astron, Fac Ciencias
  • ,
  • Tiago L. Campante, Univ Porto, Universidade do Porto, Inst Astrofis & Ciencias Espaco, CAUP, Univ Porto, Universidade do Porto, Dept Fis & Astron, Fac Ciencias
  • ,
  • William J. Chaplin, Univ Birmingham, University of Birmingham, Sch Phys & Astron
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  • Natalie Krivova, Max Planck Inst Sonnensyst Forsch, Max Planck Society
  • ,
  • Sami K. Solanki, Max Planck Inst Sonnensyst Forsch, Max Planck Society
  • ,
  • Maximilian Stritzinger
  • Mads F. Knudsen

Observations of Sun-like stars over the past half-century have improved our understanding of how magnetic dynamos, like that responsible for the 11 yr solar cycle, change with rotation, mass, and age. Here we show for the first time how metallicity can affect a stellar dynamo. Using the most complete set of observations of a stellar cycle ever obtained for a Sun-like star, we show how the solar analog HD 173701 exhibits solar-like differential rotation and a 7.4 yr activity cycle. While the duration of the cycle is comparable to that generated by the solar dynamo, the amplitude of the brightness variability is substantially stronger. The only significant difference between HD 173701 and the Sun is its metallicity, which is twice the solar value. Therefore, this provides a unique opportunity to study the effect of the higher metallicity on the dynamo acting in this star and to obtain a comprehensive understanding of the physical mechanisms responsible for the observed photometric variability. The observations can be explained by the higher metallicity of the star, which is predicted to foster a deeper outer convection zone and a higher facular contrast, resulting in stronger variability.

OriginalsprogEngelsk
Artikelnummer46
TidsskriftAstrophysical Journal
Vol/bind852
Nummer1
Antal sider12
ISSN0004-637X
DOI
StatusUdgivet - 1 jan. 2018

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