@article{Ruelas-Mayorga_Sánchez_Herrera_Nigoche-Netro_2016, title={CCD Photometry of M15}, volume={46}, url={https://journals.unam.mx/index.php/revmexaa/article/view/23596}, abstractNote={We present CCD observations of the galactic globular cluster M15, in the B and V lters. The cluster was reasonably covered, except in its northern region where our observations present a gap. We obtained a Hertzsprung-Russell (HR) diagram for each region observed, and later we produced a combined HR diagram containing more than 3000 stars. We generate a clean Colour Magnitude Diagram (CMD) and a Super Fiducial Line (SFL). Application of several methods and isochrone fitting leads us to obtain values for the metallicity [Fe/H]M15 ~ -2.16 ± 0.10, the reddening E(B - V )M15 ~ 0:11 ± 0.03, and a distance<br />modulus of [(m - M)0]M15 ~ 15:03.}, number={1}, journal={Revista Mexicana de Astronomía y Astrofísica}, author={Ruelas-Mayorga, A. and Sánchez, L. J. and Herrera, G. and Nigoche-Netro, A.}, year={2016}, month={Jan.} }