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Distances to galaxies from the brightest stars in the Universe |
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| Authors: | Rolf-Peter Kudritzki Miguel A Urbaneja |
| Institution: | 1. Max-Planck-Institute for Astrophysics, Karl-Schwarzschild-Str.1, 85741, Garching, Germany 2. University Observatory Munich, Scheinerstr. 1, 81679, Munich, Germany 3. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, 96822, USA |
| Abstract: | Blue Supergiants (BSGs) are the brightest stars in the universe at visual light with absolute magnitudes up to M V =−10 mag. They are ideal stellar objects for the determination of extragalactic distances, in particular, because the perennial uncertainties troubling most of the other stellar distance indicators, interstellar extinction and metallicity, do not affect them. The quantitative spectral analysis of low resolution spectra of individual BSGs provides accurate stellar parameters and chemical composition, which are then used to determine accurate reddening and extinction from photometry for each individual object. Accurate distances can be determined from stellar gravities and effective temperatures using the “Flux Weighted Gravity–Luminosity Relationship (FGLR)”. |
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