The Fainting of Alpha Cen A

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

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2108a&link_type=abstract

Chandra Proposal ID #08200625

Physics

Chandra Proposal Id #08200625

Scientific paper

Alpha Centauri (G2V+K1V) is the nearest system of solar-like stars; the primary has long been regarded a solar twin. Historical 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 by Chandra. The 35 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 rising out of a cycle minimum, while the G star has experienced a startling, unprecedented plunge in its X-ray luminosity that calls into question our understanding of stellar dynamos. A deep LETGS spectrum, and two short HRC-I snapshots, will build on this remarkable coronal narrative.

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