Morphology, kinematics and modelling of the elliptical planetary nebula Sa 2-21 |
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| Authors: | D. J. Harman M. Bryce M. P. Redman A. J. Holloway |
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| Affiliation: | Jodrell Bank Observatory, Department of Physics &Astronomy, University of Manchester, Macclesfield, Cheshire SK11 9DL;Department of Physics and Astronomy, University College London, Gower St., London WC1E 6BT |
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| Abstract: | ![]()
The little studied PN, Sa 2-21 has been observed using the Manchester echelle spectrometer at the Anglo-Australian telescope. Narrow band, long-slit spectra were obtained at six positions over two perpendicular position angles in both the [N ii ]λ6584 Å and [O iii ]λ5007 Å emission lines. An [O iii ] halo has been detected for the first time. A morphological modelling program was used to help determine the geometry, structure and kinematics of this ellipsoidal PN. It is proposed that the structure includes a pair of mid-latitude rings of [N ii ] emission, not previously seen in elliptical PNe. Radial spokes of [O iii ] emission have been detected in the main nebular shell indicating the presence of dynamical instabilities. |
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| Keywords: | ISM: kinematics and dynamics planetary nebulae: individual: Sa 2-21 |
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