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The most luminous stars in the Galaxy and the Magellanic Clouds
Wolf-Rainer Hamann, Andreas Barniske, Adriane Liermann +3
Some of the Wolf-Rayet stars are found to have very high bolometric luminosities (more than 1000000 solar). We employ the Potsdam Wolf-Rayet (PoWR) model atmospheres for their spec…
X-rays, clumping and stellar wind structures
Lidia Oskinova, Wolf-Rainer Hamann, Richard Ignace +1
X-ray emission is ubiquitous among massive stars. In the last decade, X-ray observations revolutionized our perception of stellar winds but opened a Pandora's box of urgent problem…
The Quintuplet Cluster II. Analysis of the WN stars
A. Liermann, W. -R. Hamann, L. M. Oskinova +2
Based on -band integral-field spectroscopy, we analyze four Wolf-Rayet stars of the nitrogen sequence (WN) found in the inner part of the Quintuplet cluster. All WN stars (WR102…
The central star of the planetary nebula PB 8: a Wolf-Rayet-type wind of an unusual WN/WC chemical composition
H. Todt, M. Peña, W. -R. Hamann +1
A considerable fraction of the central stars of planetary nebulae (CSPNe) are hydrogen-deficient. As a rule, these CSPNe exhibit a chemical composition of helium, carbon, and oxyge…
Hard X-ray emission in the star-forming region ON2: discovery with XMM-Newton
L. M. Oskinova, R. A. Gruendl, R. Ignace +3
We obtained X-ray XMM-Newton observations of the open cluster Berkeley 87 and the massive star-forming region (SFR) ON 2. In addition, archival infrared Spitzer Space Telescope obs…