Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..598h&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Oct. 15, 1980, p. 598-601.
Astronomy and Astrophysics
Astrophysics
17
Spiral Galaxies, Stellar Luminosity, Stellar Spectra, Supergiant Stars, A Stars, H Lines, Line Spectra, Spectrum Analysis, Stellar Magnitude, Stellar Parallax
Scientific paper
The first spectra of individual stars outside our own Local Group of galaxies have been obtained for suspected supergiants in the fields of Ml0l and NGC 2403. Four stars in NGC 2403 and three in Ml0l are confirmed to be members. The visually brightest stars in both galaxies are A-type supergiants, and their spectral characteristics are consistent with the luminosities derived from their membership in M 101 and NGC 2403. The visual luminosities of the A-type supergiants are - 9.4 mag for the one in NGC 2403 and -10.3 mag and -10.1 mag for the two in Ml0l. These two supergiants in M 101 are the visually brightest normal stars yet known in any galaxy.
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