To determine the mass of stars in the Pleiades cluster that have evolved into red giants, one can use established relationships between stellar mass, lifetime, and luminosity. The discussion highlights the need for common formulas rather than deriving them from scratch, as well as the importance of relating a star's age to its luminosity. Participants inquire about the necessity of such relationships and whether specific data, like the Sun's temperature and mass, is required for normalization. Overall, the conversation emphasizes the use of existing astronomical resources and formulas to find the necessary mass values. Understanding these relationships is crucial for accurately assessing the evolutionary stages of stars in the cluster.
