EDP Sciences
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Volume 420, Number 1, June II 2004
Page(s) 213 - 215
Section Galactic structure, stellar clusters and populations
DOI http://dx.doi.org/10.1051/0004-6361:20040137

A&A 420, 213-215 (2004)
DOI: 10.1051/0004-6361:20040137

Research Note

RR Lyrae stars in the outer region of the globular cluster M 3: A shortage of long periods at r ~ 3.5 to 6 arcmin?

D. J. Butler

Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
(Received 27 June 2003 / Accepted 31 March 2004 )

An analysis of the radial distribution of ab-type RR Lyrae star periods in the outer region of the globular cluster M 3 at  $r \ge 0.83^\prime$ has been performed. That analysis points towards a real shortage of stars with long periods in the radial distance range 3.5 $^\prime$ to 6 $^\prime$ (or about 7 to 12 core radii). A brief discussion is presented. The origin of the phenomenon remains an open question.

Key words: stars: variables: RR Lyr -- stars: horizontal-branch -- stars: evolution -- globular clusters: general -- globular clusters: individual: M 3

SIMBAD Objects

© ESO 2004