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physical object > natural object > celestial body > star > metal-poor star > horizontal branch star > RR Lyrae star > Bailey type > RRab star

RRab star comparison table

Subject	has amplitude	is a kind of	has definition
Bailey type		RR Lyrae star	A classification of RR Lyrae stars according to the shape and amplitude of their light variation
RRab star	larger than RRc star	Bailey type	A sub-class of Bailey type RR Lyrae variables, having asymmetric light curves of large amplitude.

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