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spectroscopic binary

spectroscopic binary

double-star system so close that the two stars can only be distinguished spectroscopically

en-GB/ˌspɛktɹəˈskɒpɪk baɪnəɹiː/

en-US/ˌspɛktɹəˈskɑpɪk ˈbaɪnɚi/

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