tau Boo's magnetic polarity switch in X-rays - continued monitoring

Details tau Boo's magnetic polarity switch in X-rays - continued monitoring tau Boo's magnetic polarity switch in X-rays - continued monitoring

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop...48p&link_type=abstract

XMM-Newton Proposal ID #06711501

Other

Stars, White Dwarfs, Solar System, Hd 120136

Scientific paper

tau Boo is the first star other than the Sun which has been observed to have a global magnetic field with switching polarity. In contrast to the Sun, tau Boo's magnetic cycle has a duration of only two years. In the previous AO, we were awarded four EPIC pointings of 8 ks each to monitor tau Boo's activity in X-rays, backing up our observations with optical measurements of the chromospheric activity as well as Zeeman Doppler Imaging. We propose to continue monitoring the star during this AO with XMM-Newton for a total of 32 ks as well as with Chandra for a total of 10 ks to gain more insight into the stellar activity cycle by comparing X-ray luminosities and coronal temperatures derived from the CCD spectra to the chromospheric activity profile and the magnetic field configuration of tau Boo.

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