The red supergiants in M31 - Spectra, colors, and luminosities

Details The red supergiants in M31 - Spectra, colors, and luminosities The red supergiants in M31 - Spectra, colors, and luminosities

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1884h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Dec. 1988, p. 1884-1907.

Astronomy and Astrophysics

Astronomy

20

Red Giant Stars, Stellar Color, Stellar Luminosity, Stellar Spectra, Supergiant Stars, Andromeda Galaxy, Dwarf Stars, Late Stars, Star Formation, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

The authors have surveyed M31 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 Å) spectra were also obtained for 45 stars. The authors have used the strength of the Ca II triplet (≈8500Å) and the J-H and H-K colors as luminosity discriminants to separate the supergiants from the foreground dwarfs. With these criteria, 23 probable late-type supergiants were identified. The authors discuss their distribution and relative numbers of the red supergiants in comparison with the known WR stars in M31. Accurate extinction and infrared (K = 2.2 μm) and bolometric luminosities are also derived from the infrared photometry.

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