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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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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 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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Article
Book reviews
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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
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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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
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
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
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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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
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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Article
A survey of the unusual motions in M17 with a Fabry-Perot monochromator
The results of the most extensive survey ever undertaken of the profiles of the [Oiii] line over M17 are presented. These were obtained with an optically-contacted, pressure-scanned, single-etalon Fabry-Perot mon...
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Chapter and Conference Paper
Recent optical observations of some evolved HII regions
A variety of recent optical observations of the HII regions in the MagellanicClouds, M42, M8, M16 and M17 are compared with observations of molecular complexes and thermal radio emission. It appears that all t...
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Article
Observations of major ionization fronts in M42 and M8
Image tube filter photographs taken in the light of the low ionization energy [Nii] and high ionization energy [Oiii] lines of the core of M42 are presented. These were taken with the 98-in. Isaac Newton telescop...
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Article
Electronographic measurements of the ionised helium abundance in the core of the Orion Nebula
Measurements have been made with an electronographic image tube spectrograph of two helium and three hydrogen lines at twenty nine positions in the dense core of the Orion Nebula.
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Article
The structure of the dense cores of Hii regions
The latest observational and theoretical evidence which suggests the existence of a large number of partially ionized globules (PIG's) in the cores of Hii regions is presented.
