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

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

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012an....333...26p&link_type=abstract

Astronomische Nachrichten, Vol.333, Issue 1, p.26

Astronomy and Astrophysics

Astronomy

1

Stars: Activity, Stars: Coronae, Stars: Chromospheres, Stars: Individual (Hd 120136), X-Rays: Stars

Scientific paper

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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