VARmallien

VARmallien is a term that refers to a specific type of variable star, characterized by their light curves that exhibit a distinctive pattern of variability. The name "VARmallien" is derived from the combination of "variable" and "mallien," a term coined by astronomers to describe the unique shape of their light curves. These stars are notable for their periodic fluctuations in brightness, which can be observed over time.

The light curves of VARmallien stars typically show a series of peaks and troughs that are not symmetrical, unlike the more common periodic variables such as Cepheids or RR Lyrae stars. The variability is often attributed to pulsations within the star's atmosphere, which cause the star's radius and temperature to change periodically. This results in a characteristic "W" or "M" shape in the light curve, depending on the specific phase of the variability.

VARmallien stars are relatively rare and are often found in specific regions of the Hertzsprung-Russell diagram, typically in the instability strip where other types of variable stars are also located. They are of particular interest to astronomers because their variability can provide insights into the star's internal structure and evolutionary stage. The study of VARmallien stars contributes to our understanding of stellar evolution and the physical processes that govern the behavior of stars.