The Instability Strip of M3

Details The Instability Strip of M3 The Instability Strip of M3

2000-04-21

arxiv.org/abs/astro-ph/0004311v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, ASP Conf. Ser. 2000, vol. 203, pg. 255 - in press

Scientific paper

We present new multicolour CCD photometry of the central part of the globular
cluster M3, mapping the precise position of ~120 RR Lyrae stars (RRab, RRd,
RRc) on the horizontal branch (HB). The location of the double-mode variables
(RRd) is in perfect agreement with recent theoretical results. We find a
significant internal spread of metallicity amongst the RRab variables.

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