An example of a "double" one of these is called Caldwell 14.
An example of a "double" one of these is called Caldwell 14. Gosta Lynga compiled the Lund catalog of these systems. These objects are classified by their detachment and concentration by the roman numerals 1 to 4; that system was developed by Robert Trumpler. These systems are thought to originate from the same giant molecular cloud, meaning their constituents have a similar (*) age and chemical composition. These bodies are not found in elliptical galaxies, and they are commonly found in the disk of a galaxy instead of the halo. Examples include the Pleiades. For 10 points, name these groups of young stars that are weakly gravitationally bound.
An example of a "double" one of these is called Caldwell 14.
open cluster [or galactic cluster]