The Cycles of Alpha Centauri

Details The Cycles of Alpha Centauri The Cycles of Alpha Centauri

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12..4.1a&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

As the nearest system of Sun-like stars, ? Centauri (G2 V + K1 V) is a "poster child" of the solar-stellar connection. This is especially true in coronal soft X-rays, where a parade of successive high-energy observatories has imaged the binary over the past three decades. I report a new analysis of ROSAT, XMM-Newton, and Chandra pointings covering 1995-2008. Although XMM-Newton found a dramatic decline in the coronal luminosity of first A in 2005, then more recently B in 2007, the "Fainting of ? Cen" now is recognized as an instrument calibration issue. Nevertheless, cycles of both stars clearly are evident in the long term record, surprisingly synchronized in the current epoch.

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