The globular cluster M3 (NGC 5272) is very rich in variable stars,with hundreds of RR Lyrae stars.

It doesn't have any representatin on most of the still photos. We've tracked with the students for 2 night on its variables.

The time sequence can be seen on the following link (scroll down the page for the processed image as well) :

M3 globular cluster, image data:
600sec exposures with Lum filter. Time sequence, over 2 nights.
Taken remotely with a 14" f/8.7 C14 Celestron and a ST8XE CCD camera.

Best regards,
Bareket observatory, Israel.