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

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

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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
Volume333
Issue number1 26
Publication statusPublished - 01 Jan 2012

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corona
magnetic field
cycles
main sequence stars
XMM-Newton telescope
newton
coronas
polarity
stars
magnetic fields
x rays

Keywords

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

Cite this

Poppenhaeger, K., Günther, H. M., & Schmitt, J. H. M. M. (2012). A magnetic cycle of τ Bootis? The coronal and chromospheric view. Astronomische Nachrichten, 333(1 26), 26.
Poppenhaeger, K. ; Günther, H. M. ; Schmitt, J. H. M. M. / A magnetic cycle of τ Bootis? The coronal and chromospheric view. In: Astronomische Nachrichten. 2012 ; Vol. 333, No. 1 26. pp. 26.
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Poppenhaeger, K, Günther, HM & Schmitt, JHMM 2012, 'A magnetic cycle of τ Bootis? The coronal and chromospheric view', Astronomische Nachrichten, vol. 333, no. 1 26, pp. 26.

A magnetic cycle of τ Bootis? The coronal and chromospheric view. / Poppenhaeger, K.; Günther, H. M.; Schmitt, J. H. M. M.

In: Astronomische Nachrichten, Vol. 333, No. 1 26, 01.01.2012, p. 26.

Research output: Contribution to journalArticle

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AU - Günther, H. M.

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AB - 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.

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KW - stars: individual (HD 120136)

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Poppenhaeger K, Günther HM, Schmitt JHMM. A magnetic cycle of τ Bootis? The coronal and chromospheric view. Astronomische Nachrichten. 2012 Jan 1;333(1 26):26.