118 citations · 1k across the 30 of their papers we have counts for
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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…
Comprehensive modelling of the planetary nebula LMC-SMP 61 and its [WC]-type central star
G. Stasińska, G. Gräfener, M. Peña +3
We present a comprehensive study of the Magellanic Cloud planetary nebula SMP 61 and of its nucleus, a Wolf-Rayet type star classified [WC 5-6]. We have performed a detailed spectr…
The Conspicuous Absence of X-ray Emission from Carbon-Enriched Wolf-Rayet Stars
L. M. Oskinova, R. Ignace, W. -R. Hamann +2
The carbon-rich WC5 star WR 114 was not detected during a 15.9 ksec XMM-Newton observation, implying an upper limit to the X-ray luminosity of Lx < 2.5*10^{30} erg/s and to the X-r…
X-ray line emission from a fragmented stellar wind
Achim Feldmeier, Lida Oskinova, Wolf-Rainer Hamann
We discuss X-ray line formation in dense O star winds. A random distribution of wind shocks is assumed to emit X-rays that are partially absorbed by cooler wind gas. The cool gas r…