42 citations · 268 across the 14 of their papers we have counts for
14 papers
The Owl and other strigiform nebulae: multipolar cavities within a filled shell
Ma. T. García-Díaz, W. Steffen, W. J. Henney +4
We present the results of long-slit echelle spectroscopy and deep narrow-band imaging of the Owl Nebula (NGC 3587), obtained at the \textit{Observatorio Astronómico Nacional, San P…
Dissecting a SN impostor's circumstellar medium: MUSEing about the SHAPE of eta Car's outer ejecta
A. Mehner, W. Steffen, J. H. Groh +10
Aims. The structural inhomogeneities and kinematics of massive star nebulae are tracers of their mass-loss history. We conduct a three-dimensional morpho-kinematic analysis of the…
3-D structures of planetary nebulae
Wolfgang Steffen
Recent advances in the 3-D reconstruction of planetary nebulae are reviewed. We include not only results for 3-D reconstructions, but also the current techniques in terms of genera…
Internal Proper-Motions in the Eskimo Nebula
Ma. T. García-Díaz, L. Gutiérrez, W. Steffen +2
We present measurements of internal proper motions at more than five hundred positions of NGC 2392, the Eskimo Nebula, based on images acquired with WFPC2 on board the Hubble Space…
The three-dimensional structure of the Eta Carinae Homunculus
W. Steffen, M. Teodoro, T. I. Madura +6
We investigate, using the modeling code SHAPE, the three-dimensional structure of the bipolar Homunculus nebula surrounding Eta Carinae, as mapped by new ESO VLT/X-Shooter observat…
A Detailed Morpho-Kinematic Model of the Eskimo, NGC 2392. A Unifying View with the Cat's Eye and Saturn Planetary Nebulae
Ma. T. García-Díaz, J. A. López, W. Steffen +1
The 3-D and kinematic structure of the Eskimo nebula, NGC 2392, has been notoriously difficult to interpret in detail given its complex morphology, multiple kinematic components an…