Dark Lanes in Star Clusters

Abstract

For generations, many observers have commented upon apparent dark lanes in star clusters, most notably the presence of clearly defined dark streaks and divides in globular clusters. While some parallels to them may be found in the meandering lanes occasionally seen in open clusters, especially around their periphery, the dark features observed in globular clusters more frequently are characterized by relatively linear, narrow formations, lanes that follow the circumference, and other more angular intrusions (Fig. 5.1).