Mass Function at the end of the Main Sequence: the M35 Open Cluster

Abstract

We present very deep RIc photometry of the M35 open cluster. We have covered 30' \times 30', equivalent to about a fourth of the total area of the cluster. The data range from I_c=17.5 to 23.5 magnitudes, and the color interval is $0.5\le (R-I{)}_c\le 2.5$. Roughly, these values correspond from $0.6M_{\odot }$ to $0.1M_{\odot }$ in the cases of members of the cluster. By using the location of the stars on a Color-Magnitude Diagram, we have selected possible members of this cluster and obtained the Luminosity and Mass Functions of the M35 open cluster and compared them with those from the Pleiades.

4 pages. "Proceedings of the III Scientific Meeting of the Spanish Astronomical Society", 1999, Astrophysics and Space Sciences, in press