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A Supergiants
N. Przybilla, F. Bresolin, K. Butler +3
A-type supergiants are primary targets for quantitative spectroscopy of individual stars in nearby galaxies because of their intrinsic brightness. An overview is given on the non-L…
The Araucaria Project. The Distance to the Local Group Galaxy NGC 6822 from Cepheid Variables discovered in a Wide-Field Imaging Survey
G. Pietrzynski, W. Gieren, A. Udalski +5
We have obtained mosaic images of NGC 6822 in V and I bands on 77 nights. From these data, we have conducted an extensive search for Cepheid variables over the entire field of the…
Spectral Modelling of Star-Forming Regions in the Ultraviolet: Stellar Metallicity Diagnostics for High Redshift Galaxies
Samantha A. Rix, Max Pettini, Claus Leitherer +3
The chemical composition of high redshift galaxies is an important property which gives clues to their past history and future evolution and yet is difficult to measure with curren…
The Double-Lined Spectrum of LBV 1806-20
Donald F. Figer, Francisco Najarro, Rolf P. Kudritzki
Despite much theoretical and observational progress, there is no known firm upper limit to the masses of stars. Our understanding of the interplay between the immense radiation pre…
The Araucaria Project. An improved distance to the Sculptor spiral galaxy NGC 300 from its Cepheid variables
W. Gieren, G. Pietrzynski, A. Walker +8
In a previous paper, we reported on the discovery of more than a hundred new Cepheid variables in the Sculptor Group spiral NGC 300 from wide-field images taken in the B and V phot…
The Physical Properties and Effective Temperature Scale of O-type Stars as a Function of Metallicity. I. A Sample of 20 Stars in the Magellanic Clouds
Philip Massey, Fabio Bresolin, Rolf P. Kudritzki +2
We have obtained HST and ground-based observations of a sample of 20 O-type stars in the LMC and SMC, including six of the hottest massive stars known (subtypes O2-3) in the R136 c…