dimHB

DimHB is a term used in the field of astrophysics to describe a class of stars that exhibit a specific type of variability in their light curves. These stars are characterized by a slow, gradual dimming of their brightness over a period of several years, followed by a more rapid recovery to their original brightness. The dimming phase is typically accompanied by a decrease in the star's effective temperature, indicating a reduction in its luminosity.

The cause of this behavior is not yet fully understood, but it is believed to be related to the star's internal structure and evolution. One proposed mechanism involves the formation of a degenerate helium core, which can lead to a decrease in the star's luminosity and effective temperature. Another possibility is that the dimming is caused by the star's outer layers expanding and cooling, which can also result in a decrease in brightness and temperature.

DimHB stars are typically found in the horizontal branch of the Hertzsprung-Russell diagram, which is a plot of stellar luminosity versus effective temperature. They are of particular interest to astronomers because they provide valuable insights into the late stages of stellar evolution and the processes that govern the structure and behavior of stars.