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Stellar Metallicity of the Extended Disk and Distance of the Spiral Galaxy NGC 3621
Rolf-Peter Kudritzki, Miguel A. Urbaneja, Fabio Bresolin +2
Low resolution ESO VLT/FORS spectra of blue supergiant stars are analyzed to determine stellar metallicities (based on elements such as Fe, Ti, Mg) in the extended disk of the spir…
Winds of low-metallicity OB-type stars: HST-COS spectroscopy in IC1613
Miriam Garcia, Artemio Herrero, Francisco Najarro +2
We present the first quantitative UV spectroscopic analysis of resolved OB stars in IC1613. Because of its alleged very low metallicity (<~1/10 Zo, from HII regions), studies in th…
Rummaging inside the Eskimo's parka: Variable asymmetric PN fast wind and a binary nucleus?
Raman Prinja, Miguel Urbaneja
We report on high-resolution optical time-series spectroscopy of the central star of the `Eskimo' planetary nebula NGC~2392. Datasets were secured with the ESO 2.3m in 2006 March a…
Quantitative Spectroscopy of Blue Supergiants in Metal-Poor Dwarf Galaxy NGC 3109
Matthew W. Hosek, Rolf-Peter Kudritzki, Fabio Bresolin +6
We present a quantitative analysis of the low-resolution (4.5 A) spectra of 12 late-B and early-A blue supergiants (BSGs) in the metal-poor dwarf galaxy NGC 3109. A modified method…