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

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.