The Cycles of Alpha Centauri

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Title:		The Cycles of Alpha Centauri
Authors:		Ayres, Thomas
Publication:		Chandra proposal ID #10200304
Publication Date:		09/2008
Origin:		CXO
Comment:		Chandra proposal ID #10200304
Bibliographic Code:		2008cxo..prop.2547A

Abstract

Alpha Centauri (G2V + K1V) is the nearest system of Sun-like stars; the primary long regarded a solar twin. The binary has been a popular target for previous X-ray missions, although the shrinking orbit now is resolvable only by Chandra. The 25 year X-ray record has revealed striking long term changes in the Alpha Cen coronae, including a deep X-ray minimum of the primary spotted by XMM in 2004-05. A recent LETGS pointing showed that the G star had become quite deficient in >2 MK emissions, but the softer 1 MK spectrum was little changed. Two additional 10 ks HRC-I snapshots in 2009 will continue this remarkable coronal narrative. We also propose key HST FUV spectra of the pair, to constrain emission measures and probe subcoronal dynamics.

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