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

✍ Scribed by K. Poppenhaeger; H.M. Günther; J.H.M.M. Schmitt

Publisher
John Wiley and Sons
Year
2012
Tongue
English
Weight
105 KB
Volume
333
Category
Article
ISSN
0004-6337

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✦ Synopsis

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 (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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