Abstract
M31 has been surveyed for its most luminous red stars; 300 candidates were found distributed across the face of the galaxy. JHK infrared photometry was observed for 57 of the candidates, and far-red (6800-8800 A) spectra were also obtained for 45 stars. The strength of the Ca II triplet (about 8500 A) and the J - H and H - K colors have been used as luminosity discriminants to separate the supergiants from the foreground dwarfs. With these criteria, 23 probable late-type supergiants were identified. Their distribution and relative numbers of the red supergiants are discussed in comparison with the known WR stars in M31. Accurate extinction and infrared (K = 2.2 microns) and bolometric luminosities are also derived from the infrared photometry. 38 references.
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