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A Lambda Boötis star (λ Boo) is a chemically peculiar star, apparently a Population I star, generally A-type. with carbon, oxygen, and nitrogen metallicity much like the Sun, but with much less iron and heavier elements. Lambda Boötis (λ Boötis) is the prototype. On the order of 50-100 are known. There is no consensus explanation: theories include attributes of the star-forming region, or accretion of less-iron-rich gas after formation.