Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-02
Astrophys.J. 582 (2003) L83-L86
Astronomy and Astrophysics
Astrophysics
9 pages, 1 table, 3 figures. Accepted for publication in the Astrophysical Journal Letters
Scientific paper
10.1086/367690
Stellar evolution calculations predict the flux-weighted gravity g/Teff^4 and absolute bolometric magnitude of blue supergiants to be strongly correlated. We use medium resolution multi-object spectroscopy of late B and early A supergiants in two spiral galaxies, NGC 300 and NGC 3621, to demonstrate the existence of such a relationship, which proves to be surprisingly tight. An analysis of high resolution spectra of blue supergiants in Local Group galaxies confirms this detection. We discuss the application of the relationship for extragalactic distance determinations and conservatively conclude that once properly calibrated it has the potential to allow for measurements of distance moduli out to 30.5 mag with an accuracy of 0.1 mag or better.
Bresolin Fabio
Kudritzki Rolf Peter
Przybilla Norbert
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