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A quantitative spectral analysis of 24 A supergiants in the Sculptor Groupspiral galaxy NGC 300 at a distance of 1.9 Mpc is presented. A new method isintroduced to analyze low resolution (~5 AE) spectra, which yieldsmetallicities accurate to 0.2 dex including the uncertainties arising from theerrors in Teff (5%) and log g (0.2 dex). For the first time the stellarmetallicity gradient based on elements such as titanium and iron in a galaxybeyond the Local Group is investigated. Solar metallicity is measured in thecenter and 0.3 solar in the outskirts and a logarithmic gradient of -0.08dex/kpc. An average reddening of E(B-V)~0.12 mag is obtained, however with alarge variation from 0.07 to 0.24 mag. We also determine stellar radii,luminosities and masses and discuss the evolutionary status. Finally, theobserved relationship between absolute bolometric magnitudes M_{bol} and fluxweighted gravities g_{F} = g/Teff^4 is investigated. At high temperatures thestrengths of the Balmer lines depends solely on the flux-weighted gravity,which allows a precise direct determination of log g_{F} with an accuracy of0.05 to 0.1 dex. We find a tight relationship between M_{bol} and log g_{F} inagreement with stellar evolution theory. Combining these new results withprevious work on Local Group galaxies we obtain a new flux weighted gravityluminosity relationship (FGLR), which is very well defined and appears to be anexcellent alternative tool to determine distances to galaxies.

astrophysical journal/the astrophysical journal

Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC  300: Flux weighted gravity luminosity relationship, metallicity and  metallicity gradient