Abstract

RUELAS-MAYORGA, A.; SANCHEZ, L. J.; HERRERA, G.  and  NIGOCHE-NETRO, A.. CCD Photometry of M15. Rev. mex. astron. astrofis [online]. 2010, vol.46, n.1, pp.3-21. ISSN 0185-1101.

We present CCD observations of the galactic globular cluster M15, in the B and V filters. 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 modulus of [(m-M)₀]_M15 ~ 15.03.

Keywords : Galaxy: halo; globular clusters: general; globular clusters: individual (NGC 7078); techniques: photometric.

        · abstract in Spanish     · text in English     · English ( pdf )