Tuesday, March 5, 2013

1303.0311 (K. Poppenhaeger et al.)

A magnetic cycle of tau Bootis? The coronal and chromospheric view    [PDF]

K. Poppenhaeger, H. M. Guenther, J. H. M. M. Schmitt
Tau 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 tau 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.
View original: http://arxiv.org/abs/1303.0311

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