The visually brightest early-type supergiants in the spiral galaxies NGC 2403, M81, and M101

Details The visually brightest early-type supergiants in the spiral galaxies NGC 2403, M81, and M101 The visually brightest early-type supergiants in the spiral galaxies NGC 2403, M81, and M101

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1156h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Nov. 1987, p. 1156-1168.

Astronomy and Astrophysics

Astronomy

24

Early Stars, Local Group (Astronomy), Spiral Galaxies, Supergiant Stars, Blue Stars, Distance, Spectral Line Width, Stellar Luminosity, Stellar Spectrophotometry

Scientific paper

Moderate-resolution spectroscopy of the candidate brightest blue stars in the nearby spirals NGC 2403, M81, and M101 reveals that many are not single stars, but compact H II regions, clusters, and multiple systems. This is an additional and serious limitation on their use as distance indicators. The derivation of the luminosities of the confirmed single blue supergiants is discussed, and, combining these results with previous work on the brightest red supergiants, a brief discussion and comparison of the evolution of their most massive stars are given. The properties of the brightest blue and red stars in NGC 2403 and M81 are basically in agreement with the pattern of massive-star evolution observed in Local Group galaxies. The distance to M101 is still controversial, but at the larger distance modulus, the luminosities of its brightest early and late-type supergiants place them beyond the Eddington limit for their initial mass and temperature.

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