Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..335h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 15, 1983, p. 335-351.
Astronomy and Astrophysics
Astrophysics
81
Astrometry, Distance, Stellar Luminosity, Supergiant Stars, A Stars, Astronomical Catalogs, Big Bang Cosmology, Brightness, Calibrating
Scientific paper
The luminosities of the brightest blue and red supergiants have been calibrated by spectra and photometry of such stars in six Local Group galaxies. The visually brightest blue supergiants are all A type supergiants. Their luminosities depend strongly on the luminosity of the parent galaxy. The brightest M supergiants have a tight upper limit to their visual luminosities at Mv0 = -8.0 ± 0.2 mag. This luminosity calibration is based on spectroscopic and photometric observations of the individual brightest red supergiants in galaxies covering a luminosity range from -20.5 mag to -14.8 mag. The upper boundary to their luminosities over such a wide range of galaxy luminosities is a consequence of massive star evolution. The M supergiants are excellent extragalactic distance indicators for spiral and Magellanic type irregular galaxies and it is possible to use them as distance indicators out to 10 Mpc.
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