Birth Sites of Young Stellar Associations and Recent Star Formation in a Flocculent Corrugated Disk

Understand

With backwards orbit integration we estimate birth locations of young stellar associations and moving groups identified in the solar neighborhood that are younger than 70 Myr.

• The birth locations of most of these stellar associations are at smaller galactocentric radius than the Sun, implying that their stars moved radially outwards after birth.
• Exceptions to this rule include are the Argus and Octans associations which formed outside the Sun's Galactocentric radius.
• Variations in birth heights of the stellar associations suggest that they were born in a corrugated disk of molecular clouds, similar to that inferred from the current filamentary molecular cloud distribution and dust extinction maps.