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Article
The design, construction and performance of a large Hα and [Nii] interference filter for the SRC 48-inch Schmidt
The design, construction and performance of a 15-in. square mosaic interference filter is described. This is designed to improve the sensitivity of the SRC 48-in. Schmidt for the detection of gaseous nebulae i...
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Chapter
Unusual, Large-Scale, Motions in HII Regions
In many HII regions, huge volumes of ionized gas emit split lines. Such splitting occurs exclusively over dark areas surrounded by bright rims; these rims, which are produced by ionization fronts eating into t...
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Article
A new large supernova remnant in the southern sky?
A faint filamentary structure on a Southern Schmidt plate is thought to be a supernova remnant.
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Article
A giant Hii ring and energetic stellar winds in the large magellanic cloud
A large ring, ≃ 50 pc diameter, of Hα+[Nii] emission in the LMC has been investigated using several instruments. It is suggested that stellar winds from O and B stars could play a vital role in the formation of t...
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Article
High velocities in the interstellar complex of M17 (NGC 6618)
High-velocity features over a velocity range of 180 km s−1 have now been definitely identified on the profiles of the Hα line from the Hii region M17. A photon-counting image tube on the intermediate grating spec...
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Article
The [Sii] electron density distribution over the planetary nebula NGC 7009
Electron densities have been measured from [Sii] 6716/6731 Å line ratios for a grid of points over the surface of the planetary nebula NGC 7009 using a photon counting detector. The radial dependence of the elect...
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Article
Expanding shells within the Helix nebula (NGC 7293)?
Filter photographs and Fabry-Pérot interferograms of the Helix nebula reveal evidence of approximately spherical expansion. Heliocentric radial velocities from +44 to −51 km s−1 have been detected over the centre...
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Article
Speckle observations of the nucleus of NGC1068
The nuclei of Seyfert galaxies contain very turbulent motion and are often intense sources of radio emission. It has been proposed that very compact supermassive objects could be the source of these energetic ...
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Chapter
Joint Commission Meeting on The Violent Interstellar
The progress in the understanding of the high velocity component of the interstellar medium is reviewed. Emphasis is on the velocities seen outside the plane of the Milky Way, of gas in the galactic halo.
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Article
Book reviews
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Chapter and Conference Paper
Co-ordinated optical and radio observations of symbiotic stars
We present preliminary results from absolutely flux-calibrated optical spectroscopy, together with 5 GHz radio flux measures of 17 symbiotic stars. The data were obtained quasi-simultaneously using the Manches...
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Chapter and Conference Paper
Echelle Measurements of the Expansion Velocities of the Faint Giant Haloes of Planetary Nebulae
The faint, giant haloes observed in many Planetary Nebulae (PNe) are believed to be the remnants of the superwinds ejected by the progenitor asymptotic giant branch stars. Spatially resolved, high spectral res...
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Chapter
An Evolutionary Model For the Wolf Rayet Nebula NGC 2539
The main outer ring of the WR nebula NGC 2539 expands radially with velocity ≈ 26kms-1. The dynamics are modelled as the interaction of the winds from the O progenitor and the present WR stage with clumpy molecul...
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Chapter
Investigating the Kinematics of the Faint, Giant Haloes of Planetary Nebulae
Some interesting results from a current program of high resolution spectroscopy of the faint, giant haloes of Planetary Nebulae are presented. Observations of optical emission line profiles show that these hal...
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Chapter
Recent Optical Observations of Circumstellar and Interstellar Phenomena
Complex motions are found over the shells which comprise the Honeycomb nebula. Evidence is presented for an episodic jet from Eta Carinae. The compact globules with radial spokes in the Helix nebula have both ...
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Chapter
High-speed flows in the vicinity of the Trapezium stars
[OUI] 5007Å line profiles at high spectral and spatial resolution have been obtained at a single slit position near the Trapezium cluster in the Orion Nebula (M42, NGC1976) using the Manchester Echelle Spectro...
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Article
Investigating the kinematics of the faint, giant haloes of Planetary Nebulae
Some interesting results from a current program of high resolution spectroscopy of the faint, giant haloes of Planetary Nebulae are presented. Observations of optical emission line profiles show that these hal...
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Article
Recent optical observations of circumstellar and interstellar phenomena
Complex motions are found over the shells which comprise the Honeycomb nebula. Evidence is presented for an episodic jet from Eta Carinae. The compact globules with radial spokes in the Helix nebula have both ...
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Article
High-speed flows in the vicinity of the Trapezium stars
[OIII] 5007 Å line profiles at high spectral and spatial resolution have been obtained at a single slit position near the Trapezium cluster in the Orion Nebula (M42, NGC1976) using the Manchester Echelle Spect...
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Article
An evolutionary model for the wolf rayet nebula NGC 2539
The main outer ring of the WR nebula NGC 2539 expands radially with velocity ≈ 26kms−1. The dynamics are modelled as the interaction of the winds from the O progenitor and the present WR stage with clumpy molecul...
