are there any other types of it?
"Yellow stragglers" or "red stragglers"
Blue straggler
"Yellow stragglers" or "red stragglers" are stars with colors between that of the turnoff and the red giant branch but brighter than the subgiant branch
some globular clusters have three main sequence tracks. this indicates UNANSWERABLE what is this cluster? It is a spherical collection of stars that orbits a galactic core. how is this clusters formed? The formation of globular clusters remains a poorly understood phenomenon and it remains uncertain whether the stars in a globular cluster form in a single generation or are spawned across multiple generations over a period of several hundred million years. what are this composed of? Globular clusters are generally composed of hundreds of thousands of low-metal, old stars. what are its exotic components? Some exotic classes of stars, such as "blue stragglers", "millisecond pulsars", and "low-mass X-ray binaries", are much more common in globular clusters. what is the first one? A blue straggler is a main-sequence star in an open or globular cluster that is more luminous and bluer than stars at the main sequence turnoff point for the cluster.
wiki:19553386
Blue straggler [SEP] Other types of stragglers
"Yellow stragglers" or "red stragglers" are stars with colors between that of the turnoff and the red giant branch but brighter than the subgiant branch. Such stars have been identified in open and globular star clusters. These stars may be former blue straggler stars that are now evolving toward the giant branch.