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HST/NICMOS observations of the GLIMPSE9 stellar cluster
Maria Messineo, Donald F. Figer, Ben Davies +4
We present HST/NICMOS photometry, and low-resolution K-band spectra of the GLIMPSE9 stellar cluster. The newly obtained color-magnitude diagram shows a cluster sequence with H-Ks =…
The progenitor mass of the magnetar SGR1900+14
Ben Davies, Don F. Figer, Rolf-Peter Kudritzki +3
Magnetars are young neutron stars with extreme magnetic fields (B > 10^{14}-10^{15}G). How these fields relate to the properties of their progenitor stars is not yet clearly establ…
The Araucaria Project. The Distance to the Small Magellanic Cloud from Near-Infrared Photometry of RR Lyrae Variables
Olaf Szewczyk, Grzegorz Pietrzynski, Wolfgang Gieren +3
We have obtained deep infrared J and K band observations of nine 4.9x4.9 arcmin fields in the Small Magellanic Cloud (SMC) with the ESO New Technology Telescope equipped with the S…
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…
The Araucaria Project. Infrared TRGB distances to the Carina and Fornax dwarf spheroidal galaxies
G. Pietrzynski, M. Gorski, W. Gieren +3
We present distance determinations for two Local Group dwarf spheroidal galaxies, Carina and Fornax, based on the near-infrared magnitudes of the tip of the red giant branch (TRGB)…
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…