The progenitor mass of the magnetar SGR1900+14 (2009)
Davies, Ben, Figer, Don F., Kudritzki, Rolf-Peter, Trombley, Christine, Kouveliotou, Chryssa, Wachter, Stefanie
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 established. However,...
Szewczyk, Olaf, Pietrzynski, Grzegorz, Gieren, Wolfgang, Ciechanowska, Anna, Bresolin, Fabio, Kudritzki, Rolf-Peter
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 SOFI infrared...
A New Distance to M33 Using Blue Supergiants and the FGLR Method (2009)
U, Vivian, Urbaneja, Miguel A., Kudritzki, Rolf-Peter, Jacobs, Bradley A., Bresolin, Fabio, Przybilla, Norbert
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 modulus of 24.93 +/-...
Bresolin, Fabio, Gieren, Wolfgang, Kudritzki, Rolf-Peter, Pietrzynski, Grzegorz, Urbaneja, Miguel A., Carraro, Giovanni
(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, including [OIII]4363,...
Chemical abundance patterns in the inner Galaxy: the Scutum Red Supergiant Clusters (2009)
Davies, Ben, Origlia, Livia, Kudritzki, Rolf-Peter, Figer, Don F., Rich, R. Michael, Najarro, Francisco, ...
The location of the Scutum Red-Supergiant (RSG) clusters at the end of the Galactic Bar makes them an excellent probe of the Galaxy's secular evolution; while the clusters themselves are ideal...
The chemical abundances in the Galactic Centre from the atmospheres of Red Supergiants (2008)
Davies, Ben, Origlia, Livia, Kudritzki, Rolf-Peter, Figer, Don F., Rich, R. Michael, Najarro, Francisco
The Galactic Centre (GC) has experienced a high degree of recent star-forming activity, as evidenced by the large number of massive stars currently residing there. The relative abundances of chemical...
Szewczyk, Olaf, Pietrzynski, Grzegorz, Gieren, Wolfgang, Storm, Jesper, Walker, Alistair, Rizzi, Luca, ...
We have obtained deep infrared $J$ and $K$ band observations of five fields located in the Large Magellanic Cloud (LMC) bar with the ESO New Technology Telescope equipped with the SOFI infrared...
Rolf-peter Kudritzki, Miguel A. Urbaneja, Fabio Bresolin, Norbert Przybilla, Wolfgang Gieren
A quantitative spectral analysis of 24 A supergiants in the Sculptor Group spiral galaxy NGC 300 at a distance of 1.9 Mpc is presented. The observational material consists of low resolution ( ∼ 5...
The cool supergiant population of the massive young star cluster RSGC1 (2007)
Davies, Ben, Figer, Don F., Law, Casey J., Kudritzki, Rolf-Peter, Najarro, Francisco, Herrero, Artemio, ...
We present new high-resolution near-IR spectroscopy and OH maser observations to investigate the population of cool luminous stars of the young massive Galactic cluster RSGC1. Using the 2.293\micron...
A massive cluster of Red Supergiants at the base of the Scutum-Crux arm (2007)
Davies, Ben, Figer, Don F., Kudritzki, Rolf-Peter, MacKenty, John, Najarro, Francisco, Herrero, Artemio
We report on the unprecedented Red Supergiant (RSG) population of a massive young cluster, located at the base of the Scutum-Crux Galactic arm. We identify candidate cluster RSGs based on {\it 2MASS}...
VLT spectroscopy of blue supergiants in IC 1613 (2007)
Bresolin, Fabio, Urbaneja, Miguel A., Gieren, Wolfgang, Pietrzynski, Grzegorz, Kudritzki, Rolf-Peter
We present multi-object spectroscopy of young, massive stars in the Local Group galaxy IC 1613. We provide the spectral classification and a detailed spectral catalog for 54 OBA stars in this galaxy....
Metal-Rich A-Type Supergiants in M31 (2006)
Przybilla, Norbert, Butler, Keith, Kudritzki, Rolf-Peter
We discuss results of an exploratory non-LTE analysis of two metal-rich A-type supergiants in M31. Using comprehensive model atoms we derive accurate atmospheric parameters from multiple indicators...
Krisciunas, Kevin, Garnavich, Peter M., Stanishev, Vallery, Suntzeff, Nicholas B., Prieto, Jose Luis, Espinoza, Juan, ...
We present optical (UBVRI) and near-infrared (YJHK) photometry of the normal Type Ia supernova 2004S. We also present eight optical spectra and one near-IR spectrum of SN 2004S. The light curves and...
Bresolin, Fabio, Pietrzynski, Grzegorz, Urbaneja, Miguel A., Gieren, Wolfgang, Kudritzki, Rolf-Peter, Venn, Kim A.
As part of the Araucaria Project, we present the first spectral catalog of supergiant stars in the Local Group dwarf irregular galaxy WLM. In assigning a spectral classification to these stars we...
Rizzi, Luca, Bresolin, Fabio, Kudritzki, Rolf-Peter, Gieren, Wolfgang, Pietrzynski, Grzegorz
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 used to derive an...
Bresolin, Fabio, Pietrzynski, Grzegorz, Gieren, Wolfgang, Kudritzki, Rolf-Peter
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. Taking advantage of the...
Rix, Samantha A., Pettini, Max, Leitherer, Claus, Bresolin, Fabio, Kudritzki, Rolf-Peter, Steidel, Charles C.
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 current techniques. In...
Bresolin, Fabio, Pietrzynski, Grzegorz, Gieren, Wolfgang, Kudritzki, Rolf-Peter, Przybilla, Norbert, Fouque', Pascal
We present a study of the photometric variability of spectroscopically confirmed supergiants in NGC 300, comprising 28 epochs extending over a period of five months. We find 15 clearly...
Stellar Winds of Hot Massive Stars Nearby and Beyond the Local Group (2003)
Bresolin, Fabio, Kudritzki, Rolf-Peter
Photospheric radiation momentum is efficiently transferred by absorption through metal lines to the gaseous matter in the atmospheres of massive stars, sustaining strong winds and mass loss rates....
Blue Supergiants as a Tool for Extragalactic Distances - Theoretical Concepts (2003)
Kudritzki, Rolf-Peter, Przybilla, Norbert
Because of their enormous intrinsic brightness blue supergiants are ideal stellar objects to be studied spectroscopically as individuals in galaxies far beyond the Local Group. Quantitative...
Quantitative spectral analysis of early B-type supergiants in the Sculptor galaxy NGC 300 (2003)
Urbaneja, Miguel Alejandro, Herrero, Artemio, Bresolin, Fabio, Kudritzki, Rolf-Peter, Gieren, Wolgang, Puls, Joachim
The spectra of two early B-type supergiant stars in the Sculptor spiral galaxy NGC 300 are analysed by means of non-LTE line blanketed unified model atmospheres, aimed at determining their chemical...
Non-LTE line-formation for CNO (2002)
Przybilla, Norbert, Kudritzki, Rolf-Peter, Butler, Keith, Becker, Sylvia R.
Accurate atomic data have become available in the recent past due to the demands of astrophysics and fusion research. We report on the impact of such data on non-LTE line-formation calculations for...
Bresolin, Fabio, Kudritzki, Rolf-Peter, Najarro, Francisco, Gieren, Wolfgang, Pietrzynski, Grzegorz
We have discovered an Ofpe/WN9 (WN11 following Smith et al.) star in the Sculptor spiral galaxy NGC 300, the first object of this class found outside the Local Group, during a recent spectroscopic...
STIS UV spectroscopy of early B supergiants in M31 (2002)
Bresolin, Fabio, Kudritzki, Rolf-Peter, Lennon, Daniel J., Smartt, Stephen J., Herrero, Artemio, Urbaneja, Miguel A., ...
We analyze STIS spectra in the 1150-1700 Angstrom wavelength range obtained for six early B supergiants in the neighboring galaxy M31. Because of their likely high (nearly solar) abundance, these...
The Wind Momentum-Luminosity relationship: blue supergiants in the spiral galaxy NGC 300 (2002)
Bresolin, Fabio, Kudritzki, Rolf-Peter, Gieren, Wolfgang
We have carried out the wind analysis of six A-type supergiants in NGC 300. The derived Wind Momentum-Luminosity Relationship is compared with that of Galactic and M31 blue supergiants and with...
Spectroscopy of blue supergiants in NGC 300 (2001)
Bresolin, Fabio, Gieren, Wolfgang, Kudritzki, Rolf-Peter, Pietrzynski, Grzegorz, Przybilla, Norbert
We have obtained VLT low-resolution (~5 A) multi-object spectroscopy in the 4,000-5,000 A spectral range of about 70 blue supergiant candidates in the Sculptor Group spiral galaxy NGC 300. We present...
Stellar spectroscopy far beyond the Local Group (2000)
Bresolin, Fabio, Kudritzki, Rolf-Peter, Mendez, Roberto H., Przybilla, Norbert
Multi-object spectroscopic observations of blue supergiants in NGC 3621, a spiral galaxy at a distance of 6.7 Mpc, carried out with the ESO VLT and FORS are presented. We demonstrate the feasibility...
Non-LTE-Effekte und Einfluss der Heliumhäufigkeit in Atmosphären von AO Ia-Überriesen / (1973)
Thesis (doctoral)--Technische Universität Berlin, 1973.