A new extragalactic distance determination method using the flux-weighted gravity of late B and early A supergiants

Abstract

Stellar evolution calculations predict the flux-weighted gravity g/T 4 eff 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… (More)

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