A-type stars are a classification of stars that are typically white or bluish in color. They have surface temperatures ranging from about 7,500 to 10,000 degrees Celsius. These stars are known for their strong hydrogen absorption lines in their spectra, which makes them distinct from other types of stars. A-type stars are often more massive than the Sun and can be found in various stages of their life cycle. These stars are usually located on the main sequence of the Hertzsprung-Russell diagram, where they fuse hydrogen into helium in their cores. A-type stars have relatively short lifespans, ranging from 1 billion to 2 billion years, before evolving into giant stars or supernovae. Their brightness and temperature make them important for studying stellar evolution and the dynamics of galaxies.