Measuring the distances to Galactic planetary nebulae (PNe) has been an intractable
problem for many decades. We have now established a robust optical statistical distance …

We present a new version of the fully three-dimensional photoionization and dust radiative
transfer code, MOCASSIN, that uses a Monte Carlo approach for the transfer of radiation …

We present narrowband near-infrared images of a sample of 11 Galactic planetary nebulae
(PNe) obtained in the H 2 2.122 μm and Brγ 2.166 μm emission lines and the K c 2.218 μm …

There is no conclusive explanation of why∼ 80 per cent of planetary nebulae (PNe) are non-
spherical. In the Binary Hypothesis, a binary interaction is a preferred channel to form a non …

We perform a comprehensive analysis of the planetary nebula (PN) NGC 6781 to investigate
the physical conditions of each of its ionized, atomic, and molecular gas and dust …

Deep spectroscopy of the planetary nebula NGC 6153 shows that its heavy element
abundances derived from optical recombination lines (ORLs) are 10 times higher than those …

Aims. The determination of reliable distances to planetary nebulae (PNe) is a major difficulty
in the study of this class of objects in the Galaxy. The availability of new photometric surveys …

Context. This is the first of a series of investigations into far-IR characteristics of 11 planetary
nebulae (PNe) under the Herschel Space Observatory open time 1 program, Herschel …

The planetary nebula SuWt 2 (PN G311. 0+ 02.4) is an unusual object with a prominent,
inclined central emission ellipse and faint bipolar extensions. It has two A-type stars in a …

Accurate distance estimates of astrophysical objects such as planetary nebulae (PNe), and
nova and supernova remnants, among others, allow us to constrain their physical …