The Further Fainting of Alpha Cen A

Details The Further Fainting of Alpha Cen A The Further Fainting of Alpha Cen A

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2330a&link_type=abstract

Chandra Proposal ID #09200253

Physics

Chandra Proposal Id #09200253

Scientific paper

Alpha Centauri (G2V + K1V) is the nearest system of solar-like stars. The primary has long been regarded a solar twin. Previous X-ray missions have been able to separate the coronal point sources (14" apart in Y2000), although the orbit now is closing rapidly and beyond 2006 can only be resolved easily by Chandra. The 25 year X-ray record has revealed striking long term changes in the Alpha Cen coronae, likely related to analogs of the still mysterious solar sunspot cycle. Recent work suggests that the K star is falling into a cycle minimum, while the G star is relapsing following a brief recovery from an unprecedented deep X-ray minimum in 2005 (that fully challenges our understanding of stellar dynamos). Two 10 ks HRC-I snapshots in 2008 will build on this remarkable coronal narrative.

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