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physical object > natural object > celestial body > star > Population II star > blue halo star

blue halo star comparison table

Subject	is a kind of	has definition
Population II star	star	Older stars, generally formed towards the centre of a galaxy, containing few heavier elements. The brightest of this Population are red giants.
blue halo star	Population II star	Hot star in the horizontal-branch, post-horizontal-branch, and post-asymptotic branch phases of evolution.

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