uvw2

UVW2 is a class of stars identified in the Ultraviolet Excess (UVX) survey conducted by the GALEX (Galaxy Evolution Explorer) satellite. These stars are notable for their strong ultraviolet emission, which is indicative of high temperatures and significant mass loss. UVW2 stars are typically massive, evolved stars, such as Wolf-Rayet stars and luminous blue variables, which are in the late stages of their stellar evolution. The UVW2 class is characterized by its position in the ultraviolet color-magnitude diagram, where it stands out due to its high ultraviolet-to-optical flux ratio. These stars play a crucial role in the chemical enrichment of the interstellar medium and are important for understanding the evolution of massive stars and the star formation history of galaxies. The study of UVW2 stars provides valuable insights into the processes of stellar evolution, mass loss, and the feedback mechanisms that influence galaxy formation and evolution.