What is the classification of Pollux in terms of its spectral class?

Pollux, also known as Beta Geminorum, is classified as a K-type giant star. The spectral classification system categorizes stars based on their temperatures and the characteristics of their spectra. K-type stars typically have surfaces that are cooler, with temperatures ranging from about 3,900 to 5,300 Kelvin.

The K classification indicates a star with a yellow-orange hue, which is a direct result of its surface temperature. Pollux, being a giant star, has evolved past the main sequence stage of its life cycle and has expanded and cooled, maintaining its K-class characteristics.

Understanding the classification helps in identifying other properties of the star, such as its luminosity and mass, which are essential in studying stellar evolution and the characteristics of different types of stars in the universe.