X-ray counterpart of the shortest activity cycle found to date

Details X-ray counterpart of the shortest activity cycle found to date X-ray counterpart of the shortest activity cycle found to date

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..151s&link_type=abstract

XMM-Newton Proposal ID #06736101

Physics

Stars, White Dwarfs, Solar System, Hr 810

Scientific paper

Activity cycles are commonly found among late type stars through the chromospheric CaII emission. Their coronal counterpart, however, remains elusive in most cases, despite of the clear cycle observed in the solar corona, spanning as much as 1.7 dex in Lx. The recent discovery of a CaII cycle in HR 810 of just 1.6 yr, the shortest to date, offers a unique opportunity to test the existence of an X-ray counterpart of the cycle within one or at most two XMM-Newton observing periods. The star offers also two more attractives: with an age of only 500 Myr and spectral type G0V it represents a young solar analog, and a planet of 1.9 Mj orbits the star at 0.9 a.u. We intend to make 8 snapshots during AO10, for a total of 40 ks, to cover 60% of the cycle starting near its lowest level of activity.

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