Open clusters serve as a useful tool for calibrating models of the relationship between mass, rotation, and age stars with an outer convection zone due to homogeneity within cluster. Cluster cluster comparisons are essential determine whether universality spin down relations holds. NGC 6709 is selected young open which no rotation periods members have previously been obtained. This at distance ...

We present a kinematic study of a large sample of chromospherically active binaries (CAB) in order to determine their membership to representative young disk stellar kinematic groups: the Local Association (Pleiades moving group, 20-150 Myr), Ursa Mayor group (Sirius super-cluster, 300 Myr), Hyades supercluster (800 Myr), IC 2391 supercluster (35 Myr) and Castor moving group (200 Myr). Precise ...

Based on kernel estimator and wavelet technique, we have identified 22 moving group candidates in the solar neighborhood from a sample which includes around 14000 dwarfs and 6000 giants. Six of them were previously known as the Hercules stream, the Sirus-UMa stream, the Hyades stream, the Caster group, the Pleiades stream and the IC 2391; five of them have also been reported by other authors. E...

This paper extends the use of stochastic watershed, recently introduced by Angulo and Jeulin [1], to unsupervised segmentation of multispectral images. Several probability density functions (pdf), derived from Monte Carlo simulations (M realizations of N rsandom markers), are used as a gradient for segmentation: a weighted marginal pdf a vectorial pdf and a probabilistic gradient. These gradien...