The Illumination and Growth of CRL 2688: An Analysis of New and Archival Hubble Space Telescope Observations
We present four-color images of CRL 2688 obtained in 2009 using the Wide-Field Camera 3 on Hubble Space Telescope. The F606W image is compared with archival...
The impact of strong recombination on temperature determination in planetary nebulae
The long-standing difference in chemical abundances determined from optical recombination lines and collisionally excited lines raises questions about our...
The impact of strong recombination on temperature determination in planetary nebulae
The long-standing difference in chemical abundances determined from optical recombination lines and collisionally excited lines raises questions about our...
The Intergalactic Stellar Population from Mergers of Elliptical Galaxies with Dark Matter Halos
We present simulations of dry-merger encounters between pairs of elliptical galaxies with dark matter halos. The aim of these simulations is to study the...
The ionised and molecular mass of post-common-envelope planetary nebulae. The missing mass problem
Context. Most planetary nebulae (PNe) show beautiful, axisymmetric morphologies despite their progenitor stars being essentially spherical. Close binarity is...
We have observed the high excitation planetary nebulae NGC 7027, NGC 6543 and the low excitation planetaries Hu 2-1 and Cn 3-1 in the optical & near IR with the...
We constrain the iron abundance in a sample of 33 low-ionization Galactic planetary nebulae (PNe) using [Fe III] lines and correcting for the contribution of...
The kinematic behaviour of optical recombination lines and collisionally excited lines in Galactic planetary nebulae*†
The kinematics of the plasma in 14 planetary nebulae (PNe) is analysed by measuring the expansion velocities (Vexp) of different ions as derived from their...