Alpheratz is a unique mercury-manganese star whose atmosphere contains abnormally high abundances of mercury, manganese, and other elements, including gallium and xenon, and is the brightest known example of these rare stars. It's also the brightest star in the constellation Andromeda, and is part of the Great Square of Pegasus. In 1988 and 1989 a faint companion star was discovered and Alpheratz was classified as a binary system.
Alpheratz is a unique mercury-manganese star whose atmosphere contains abnormally high abundances of mercury, manganese, and other elements, including gallium and xenon, and is the brightest known example of these rare stars. It's also the brightest star in the constellation Andromeda, and is part of the Great Square of Pegasus. In 1988 and 1989 a faint companion star was discovered and Alpheratz was classified as a binary system.
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