Acoustic modes in M67 cluster stars trace deepening convective envelopes.

ABSTRACT: Acoustic oscillations in stars are sensitive to stellar interiors¹. Frequency differences between overtone modes-large separations-probe stellar density², whereas differences between low-degree modes-small separations-probe the sound-speed gradient in the energy-generating core of main-sequence Sun-like stars³, and hence their ages. At later phases of stellar evolution, characterized by inert cores, small separations are believed to lose much of their power to probe deep interiors and become proportional to large separations^4,5. Here we present evidence of a rapidly evolving convective zone as stars evolve from the subgiant phase into red giants. By measuring acoustic oscillations in 27 stars from the open cluster M67, we observe deviations of pr

SUBMITTER: Reyes C 

PROVIDER: S-EPMC11981917 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature