Infrared luminosities of M supergiants and their use as distance indicators

Details Infrared luminosities of M supergiants and their use as distance indicators Infrared luminosities of M supergiants and their use as distance indicators

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249l..55e&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 249, Oct. 15, 1981, p. L55-L59.

Astronomy and Astrophysics

Astrophysics

15

Astrometry, Infrared Stars, M Stars, Stellar Luminosity, Supergiant Stars, Abundance, Infrared Spectrophotometers, Metals, Milky Way Galaxy, Red Giant Stars, Spectral Energy Distribution

Scientific paper

The K (2.2-micron) luminosities of the brightest red supergiants in five Local Group galaxies are shown by IR photometry to range from about -12 mag in the Milky Way and the LMC to approximately -11.4 mag in the SMC, NGC 6822, and IC 1613. This variation in the maximum K luminosity is due to the differences in the spectral type distribution of the M supergiants in the three smaller irregulars, perhaps resulting from their lower metal abundance, which may be correlated with the mass and luminosity of the galaxy. Without further information on the spectral type of the star, the usefulness of the M supergiants as distance indicators in the IR is limited.

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