63 citations · 102 across the 3 of their papers we have counts for
4 papers
Discovery of X-ray Emission from the Wolf-Rayet star WR142 of oxygen subtype
L. M. Oskinova, W. -R. Hamann, A. Feldmeier +2
We report the discovery of weak yet hard X-ray emission from the Wolf-Rayet (WR) star WR142 with the XMM-Newton X-ray telescope. Being of spectral subtype WO2, WR142 is a massive s…
The Quintuplet Cluster I. A K-band spectral catalog of stellar sources
A. Liermann, W. -R. Hamann, L. M. Oskinova
Three very massive clusters are known to reside in the Galactic Center region, the Arches cluster, the Quintuplet cluster and the Central parsec cluster. We obtained spectroscopic…
Revised element abundances for WC-type central stars
H. Todt, G. Gräfener, W. -R. Hamann
According to previous spectral analyses of Wolf-Rayet type central stars, late [WC] subtypes show systematically higher carbon-to-helium abundance ratios than early [WC] subtypes.…
X-ray emission lines from inhomogeneous stellar winds
L. M. Oskinova, A. Feldmeier, W. -R. Hamann
It is commonly adopted that X-rays from O stars are produced deep inside the stellar wind, and transported outwards through the bulk of the expanding matter which attenuates the ra…