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Red supergiant
Red supergiants (RSGs) are stars with a supergiant luminosity class (Yerkes class I) and a stellar classification K or M.[1] They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous. Betelgeuse and Antares A are the brightest and best known red supergiants (RSGs), indeed the only first magnitude red supergiant stars.
- ^ Henny J. G. L. M. Lamers; Joseph P. Cassinelli (17 June 1999). Introduction to Stellar Winds. Cambridge University Press. pp. 53–. ISBN 978-0-521-59565-0. Retrieved 31 August 2012.
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