Circumstellar environment around young stars in nearby OB associations

Abstract

We study the circumstellar environment around intermediate mass young stars in nearby OB associations of different ages. We find that a significant fraction of stars in these associations ha.ve cool circumstellar dust around them. Very few of these stars show any emission line activity. These are young Vega-like systems with tenuoUB dusty disks made of material left over from a more active pre-main sequence phase.