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barium star

A giant star of spectral type G2 to K4 whose spectrum contains unusually strong absorption lines of barium (notably the 4554 Å line) and of some other heavy elements sych as strontium. Also known as heavy-metal stars or Ba II stars, barium stars are thought to have been contaminated with byproducts of nuclear fusion by companions that have already far evolved and are now white dwarfs. An example is Altarf (Beta Cancri).

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