A&A 420, 213-215 (2004)
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 has been performed. That analysis points towards a real shortage of stars with long periods in the radial distance range 3.5 to 6 (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
© ESO 2004