A magnetic cycle of τ Bootis? The coronal and chromospheric view

K. Poppenhaeger, H. M. Günther, J. H. M. M. Schmitt

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14 Citations (Scopus)


τ Bootis is a late F-type main sequence star orbited by a Hot Jupiter. During the last years spectropolarimetric observations led to the hypothesis that this star may host a global magnetic field that switches its polarity once per year, indicating a very short activity cycle of only one year duration. In our ongoing observational campaign, we have collected several X-ray observations with XMM-Newton and optical spectra with TRES/FLWO in Arizona to characterize τ Boo's corona and chromosphere over the course of the supposed one-year cycle. Contrary to the spectropolarimetric reconstructions, our observations do not show indications for a short activity cycle.
Original languageEnglish
Pages (from-to)26
JournalAstronomische Nachrichten
Issue number1 26
Publication statusPublished - 01 Jan 2012


  • stars: activity
  • stars: coronae
  • stars: chromospheres
  • stars: individual (HD 120136)
  • X-rays: stars


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