FTP, name these spherical collections of old stars that are distinguished from the open variety of the same type of object by their old age.
A method for distance determination using these objects, which are described by the Plummer Model, involves comparing the turnover magnitude of a sample  to that of a sample from nearby galaxies. In addition to their namesake luminosity function, these objects, which include 47 Tucanae, are observed in amounts proportional to their galaxy's luminosities. They are drawn in to the center of their galaxies by dynamical friction and their age can be determined by their turnoff point on an HR diagram. Blue Stragglers are inordinately bright and young stars that appear in these collections of old population II stars that orbit in the halo of every galaxy in the local group. FTP, name these spherical collections of old stars that are distinguished from the open variety of the same type of object by their old age.
A method for distance determination using these objects, which are described by the Plummer Model, involves comparing the turnover magnitude of a sample  to that of a sample from nearby galaxies.
Globular Clusters