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physical object > natural object > celestial body > collection of stars > star system > binary star > close binary > eclipsing binary > BM Orionis
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BM Orionis comparison table
Subject is part of is an instance of is a kind of has definition
eclipsing binary  close binaryEclipsing variables whose orbital plane lies so nearly in the line of sight that eclipses, as seen from the Earth, can occur and can be detected from their light curves.
BM OrionisOrioneclipsing binary A peculiar eclipsing binary (B2-B3) in the Trapezium, with a flat-bottomed light curve suggesting a total eclipse. The spectrum of the secondary has never been seen.

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