New nearby young star cluster candidates within 200 pc

Abstract

I briefly describe two new young star cluster candidates found within 200 pc of the Sun, associated with the 4th-magnitude stars Oph and 32 Ori. The Oph group (d 170pc) has a space motion and age (~120 25 Myr) suspiciously similar to the Pleiades, but lies in the opposite side of the sky behind ~0.9 mag of visual extinction in Ophiuchus. The 32 Ori group is a nearby (d 90 pc) loose aggregate of ~25-Myr-old post-T Tauri stars co-moving with the massive binary 32 Ori (B5V+B7V) in northern Orion. The 32 Ori group accounts for part of the population of isolated Li-rich RASS pre-MS stars in northern Orion. © 2007 International Astronomical Union.