Ultralow-amplitude RR Lyrae Stars in M4

Wallace, JJ; Hartman, JD; Bakos, GA; Bhatti, W

Wallace, JJ (reprint author), Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA.

ASTROPHYSICAL JOURNAL LETTERS, 2019; 870 (1):

Abstract

We report evidence for a new class of variable star, which we dub millimagnitude RR Lyrae (mmRR). From K2 observations of the globular cluster M4, we ......

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