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The Araucaria Project: The Distance to NGC 300 from the Red Giant Branch Tip using HST/ACS imaging
Luca Rizzi, Fabio Bresolin, Rolf-Peter Kudritzki +2
We have used the Advanced Camera for Surveys on board the Hubble Space Telescope to obtain deep photometry of the NGC 300 spiral galaxy in the Sculptor group. The results have been…
The Araucaria Project: The effect of blending on the Cepheid distance to NGC 300 from Advanced Camera for Surveys images
Fabio Bresolin, Grzegorz Pietrzynski, Wolfgang Gieren +1
We have used the Advanced Camera for Surveys aboard the Hubble Space Telescope to obtain F435W, F555W and F814W single-epoch images of six fields in the spiral galaxy NGC 300. Taki…
A VLT study of metal-rich extragalactic H II regions. I. Observations and empirical abundances
Fabio Bresolin, Daniel Schaerer, Rosa Gonzalez Delgado +1
We have obtained spectroscopic observations from 3600 Angstrom to 9200 Angstrom with FORS at the Very Large Telescope for approximately 70 H II regions located in the spiral galaxi…
The near-IR luminosity-metallicity relation of dwarf irregular galaxies
Ivo Saviane, Enrico V. Held, Valentin Ivanov +5
We report on the recent developments of our long-term investigation of the near-IR luminosity-metallicity relation for dwarf irregular galaxies in nearby groups. A very well-define…
The Physical Properties and Effective Temperature Scale of O-type Stars as a Function of Metallicity. II. Analysis of 20 More Magellanic Cloud Stars, and Results from the Complete Sample
Philip Massey, Joachim Puls, A. W. A. Pauldrach +3
We analyze the optical and UV spectra of an additional sample of 20 Magellanic Cloud O stars, and draw conclusions from the complete sample of 40 stars. We find (1) The SMC O3-7 dw…
Metal abundances in extremely distant Galactic old open clusters. II. Berkeley 22 and Berkeley 66
Sandro Villanova, Giovanni Carraro, Fabio Bresolin +1
We report on high resolution spectroscopy of four giant stars in the Galactic old open clusters Berkeley~22 and Berkeley~66 obtained with HIRES at the Keck telescope. We find that…