stars with a supergiant luminosity class
Red supergiants (RSGs) are stars with a supergiant luminosity class (Yerkes class I) and a stellar classification K or M. 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.
Hertzsprung–Russell diagram
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).