Overtone and multi-mode RR Lyrae stars in the globular cluster M3

J. Jurcsik, P. Smitola, G. Hajdu +15

The overtone and multi-mode RR Lyrae stars in the globular cluster M3 are studied using a 200-d long, $B,V$ and $I_{\mathrm{C}}$ time-series photometry obtained in 2012. 70\% of the…