Program: GN-2009B-Q-47

We propose to observe spectroscopically the 5 brightest planetary nebulae (PNe) and the central diffuse arc-like HII regions in the dwarf spheroidal galaxy NGC185. Through PNe, we will obtain the interstellar medium (ISM) chemical composition at the time when their stellar progenitors were born, by considering elements that are not processed during the whole progenitor lifetime. The chemical parameters derived from the HII region will give us information about the present ISM chemistry. These properties will be interpreted in terms of the chemical evolution of NGC185 itself, and, combined with the chemistry of other dwarf galaxies of the Local Group (LG), in terms of the chemical evolution of the LG as a whole. For NGC185 GMOS data is also crucial to solve the problem of its status of Seyfert galaxy, without any detection of a central black hole. It was suggested that the line emission of its central region come from its Post-AGB (PNe) population. For the first time, this suggestion will be tested. Pre-imaging (B600+R400 mask) for this program was obtained in 2008B. Depending on the availability and technical details of the new B600 this mask could be used now.