Coronal activity cycles in solar analog stars

Details Coronal activity cycles in solar analog stars Coronal activity cycles in solar analog stars

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop...17f&link_type=abstract

XMM-Newton Proposal ID #06008203

Physics

Stars, White Dwarfs, Solar System, Hd 81809, 61 Cyg

Scientific paper

The present program to detect and study for the first time solar-like cycles in the X-ray emission of stars similar to our Sun has been ongoing since XMM s AO-1. Five targets in three stellar systems have been monitored from 2001, providing for the first time clear evidence of long-term cycles in the X-ray luminosity of normal stars, with variations in X-ray luminosity of up to an order of magnitude. The present proposal requests continuation of the ongoing monitoring program into XMM AO-8, needed to progress toward full characterization of the coronal cycle for our targets. The most observed of our targets (HD 81809) will enter its cycle maximum during the XMM AO-8 period, and given the higher variability expected at maximum, we request a more frequent sampling for this target.

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