Spectral type F refers to a classification of stars that have surface temperatures ranging from about 6,000 to 7,600 Kelvin. These stars typically appear white or yellowish in color and are known for their strong hydrogen lines in their spectra. They are often more massive and luminous than the Sun, making them important for studying stellar evolution. Stars of spectral type F are often found in the main sequence phase of their life cycle. Examples of F-type stars include Procyon and Aldebaran. Their characteristics help astronomers understand the processes that govern star formation and the chemical composition of the universe.