Deep and Extended Multiband Photometry of the Galactic Globular Cluster M71 [chapter]

Alessandra Di Cecco, Giuseppe Bono, Matteo Monelli, Peter B. Stetson, Rosa Becucci, Scilla Degl'Innocenti, Pier G. Prada Moroni, Roberto Buonanno
2011 Astrophysics and Space Science Proceedings  
We present wide-field ground based photometry for the Galactic globular cluster M92. Data were collected in the SDSS bands (u , g , r , i , z ) with the MegaCam@CFHT. We confirm the occurrence of cluster stars beyond the tidal radius. Moreover, we find that the ratio between the Horizontal Branch (HB) stars and Main Sequence (MS) stars across the turn-off region clearly decreases by a factor of two when moving from the centre to the outermost regions of the cluster.
doi:10.1007/978-3-642-22113-2_29 fatcat:mrnduljg75gllafqorjejfja2y