Main Sequence

The name given for the line in the H-R diagram along which stars lie that are burning hydrogen in their cores. The majority of a star's lifetime is spent as a main sequence star.

Main Sequence

Figure: A HR-Diagram of a young star cluster showing the main sequence. From the dim and red to the bright and blue, the main sequence runs from low mass ( 0.01 solar masses) to high mass (several × 10 solar masses) stars.