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Age Dating Stellar Populations in the Near Infrared: An absolute age indicator from the presence/absence of red supergiants
J. Zachary Gazak, N. Bastian, R. P. Kudritzki +4
The determination of age is a critical component in the study of a population of stellar clusters. In this letter we present a new absolute age indicator for young massive star clu…
Distances to Galaxies from the Brightest Stars in the Universe
R. -P. Kudritzki, M. A. Urbaneja
Blue Supergiants (BSGs) are the brightest stars in the universe at visual light with absolute magnitudes up to Mv=-10 mag. They are ideal stellar objects for the determination of e…
Quantitative Spectroscopy of Blue Supergiant Stars in the Disk of M81: Metallicity, Metallicity Gradient and Distance
R. -P. Kudritzki, M. A. Urbaneja, Z. Gazak +4
The quantitative spectral analysis of low resolution Keck LRIS spectra of blue supergiants in the disk of the giant spiral galaxy M81 is used to determine stellar effective tempera…
A New Distance to M33 Using Blue Supergiants and the FGLR Method
Vivian U, Miguel A. Urbaneja, Rolf-Peter Kudritzki +3
The quantitative spectral analysis of medium resolution optical spectra of A and B supergiants obtained with DEIMOS and ESI at the Keck Telescopes is used to determine a distance m…
Extragalactic chemical abundances: do HII regions and young stars tell the same story? The case of the spiral galaxy NGC 300
Fabio Bresolin, Wolfgang Gieren, Rolf-Peter Kudritzki +3
(Abridged) We have obtained new spectrophotometric data for 28 HII regions in the spiral galaxy NGC 300, a member of the nearby Sculptor Group. The detection of auroral lines, incl…
The Araucaria Project. The Distance to the Sculptor Galaxy NGC 247 from Near-Infrared Photometry of Cepheid Variables
W. Gieren, G. Pietrzynski, I. Soszynski +7
We have obtained deep near-infrared images in J and K filters of four fields in the Sculptor Group spiral galaxy NGC 247 with the ESO VLT and ISAAC camera. For a sample of ten Ceph…