YOUNG STARS NEAR EARTH: THE OCTANS-NEAR ASSOCIATION AND CASTOR MOVING GROUP

摘要: All cataloged stellar moving groups and associations with ages ≤100 Myr within 100 pc of Earth have Galactic space motions (UVW) situated in a good box dimensions ~20 km s–1 on side. Torres et al. defined the Octans Association as group 15 stars age 20 Myr? located ~140 pc from Earth, but average V velocity –3.6 km s–1 that is well outside box. We present list 14 Hipparcos star systems we call Octans-Near; these UVW similar to those much more distant Association. The Octans-Near apparent between about 30 100 Myr their relationship unclear. Six additional likely ≤200 Myr. These six include late-type binary EQ Peg—6.2 pc thus be nearest known pre-main sequence system. previously proposed ~200 Myr old Castor are not too dissimilar stars. However, group—if it exists at all—are mostly substantially older than 200 Myr generally can readily distinguished younger