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physical object > natural object > celestial body > star > Population II star > blue horizontal-branch star

blue horizontal-branch star comparison table

Subject	is a kind of	has synonym	has definition
Population II star	star	halo star	Older stars, generally formed towards the centre of a galaxy, containing few heavier elements. The brightest of this Population are red giants.
blue horizontal-branch star	Population II star	HZ star	Blue horizontal-branch star, the first catalog of which was compiled by Humason and Zwicky.

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