演講資訊

摘要：

In this talk, I will revisit the long-standing question in stellar astrophysics: Why do post–main-sequence stars evolve into red giants (RGs) or red supergiants (RSGs)? By comparing stellar evolution models that reach the RG/RSG phase with those that remain blue, we show that envelope expansion follows a refined “mirror principle.” Building on this result, we construct steady-state envelope models to identify the physically realizable configurations of stellar envelopes. These solutions verify the refined mirror principle and clarify the physical nature of the RG/RSG phase as a limiting configuration of stellar structure, which is consistent with the classical Hayashi limit.