RR Lyrae stars in the outer region of the globular cluster M3: a   shortage of long periods at r ~ 3.5 to 6 arcmin ?
  An analysis of the radial distribution of ab-type RR Lyrae star periods in the outer region of the globular cluster M3 at r >= 0.83 arcmin has been performed. That analysis points towards a real shortage of stars with long periods in the radial distance range 3.5 to 6 arcmin (or about 7 to 12 core radii). A brief discussion is presented. The origin of the phenomenon remains an open question. 
D. J. Butler, (MPIA, Heidelberg, Germany)