Low-mass young stars in Cep OB2: Ages, distribution and accretion disks

We are studying the young clusters Tr37 and NGC7160 in the Cep OB2 region as part of a program to understand the evolution of accretion disks at the ages of disk dissipation and planet formation. Here, we present the first identifications of low mass ( spectral types K-M) members of the clusters and study the presence and characteristics of their accretion disks, finding evidences of disk evolution. Using optical photometry and spectroscopy, we have identified similar to 70 members in Tr37 and similar to 20 in NGC7160, confirming age estimates of 3 and 10 Myr respectively. Accretion rates are similar to 10(-8)M(.) yr(-1) in Tr37. We have not found any accreting members in NGC7160, suggesting that disk accretion generally ends before the age of 10 Myr, which is consistent with the results from other populations.