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2022RNAAS...6...24A - Research Notes of the AAS, 6, 24 (2022/February-0)

X-Ray Chronicles of Alpha Centauri: The Swooning of α Cen B.

AYRES T.

Abstract (from CDS):

The central AB binary of Alpha Centauri has been visited regularly by Chandra X-ray Observatory since late 2005. Up to mid-2020, the B component, an early K dwarf, had traced out a relatively smooth 8 yr coronal (T ∼ 2 MK) activity cycle. Recently, however, B's X-ray count rate suddenly dipped, from cycle maximum levels to near minimum in just 16 months. Previous cycle decays were 3-4 yr. The significance of the swoon remains to be seen.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): X-ray stars - Stellar activity - Solar cycle

Simbad objects: 4

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