The Galactic star cluster NGC 4337: estimates of its photometric and dynamical mass

In this contribution we discuss various estimates of the mass of NGC 4337, an old open cluster located in the inner Galactic disk. We derive its mass in different ways. First, we obtain a lower estimate of the cluster mass using the surface density profile of the cluster and its luminosity and mass function by means of star counts out of a photometric data set in the UBVI passbands. This data set is also used to derive fundamental cluster parameters. Second, we obtain dynamical estimates of the cluster mass as based on a large survey of cluster star radial velocities. The dynamical estimates correspond to significantly larger values than those from star count estimates. We can roughly match these two estimate sets taking into account the contribution of invisible mass in the form of both low mass stars and remnants of high mass stars in the cluster.