Barlow, MJ;
(2012)
Probing the properties of nebular plasmas with optical and infrared spectroscopy.
In: Aggarwal, K and Shearer, F, (eds.)
AIP Conference Proceedings.
(pp. pp. 103-110).
AIP Publishing
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Abstract
A number of current developments arising from spectroscopic studies of ionized nebulae are reviewed. Until the past decade or so, such studies were generally confined to the analysis of recombination lines from hydrogen and helium, along with collisionally excited forbidden lines from second and third row elements in the periodic table. However, the advent of efficient detectors on 8m-class telescopes has enabled the detection of recombination lines from second and third row elements, along with collisionally excited lines from much less abundant species. Significant discrepancies have been found between ionic abundances derived from collisionally excited lines and those obtained for the same ions from their recombination lines. The existence of ‘cold plasma’ with Te ≤ 1000 K has been confirmed for a number of planetary nebulae. Optical and infrared collisionally excited ionic lines from a wide range of ‘neutron-capture’ elements from beyond the iron abundance peak have also been detected. There is a consequent need for new calculations and experimental measurements of the atomic data needed to interpret these observations.
| Type: | Proceedings paper |
|---|---|
| Title: | Probing the properties of nebular plasmas with optical and infrared spectroscopy |
| Event: | 17th International Conference on Atomic Processes in Plasmas (ICAPiP) |
| Location: | Queens Univ, Belfast, NORTH IRELAND |
| Dates: | 19 July 2011 - 22 July 2011 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.4707863 |
| Publisher version: | https://doi.org/10.1063/1.4707863 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Nebulae, Atomic Processes, Spectroscopy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10095230 |
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