A magnetic cycle of τ Bootis? The coronal and chromospheric view
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.
- Publication:
-
Astronomische Nachrichten
- Pub Date:
- January 2012
- DOI:
- 10.1002/asna.201111614
- arXiv:
- arXiv:1303.0311
- Bibcode:
- 2012AN....333...26P
- Keywords:
-
- stars: activity;
- stars: coronae;
- stars: chromospheres;
- stars: individual (HD 120136);
- X-rays: stars;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 4 pages, 2 figures, appeared in Astronomical Notes 333, 1, 26-29 (2012)