Morphology, kinematics and modelling of the elliptical planetary nebula Sa 2-21

Details Morphology, kinematics and modelling of the elliptical planetary nebula Sa 2-21 Morphology, kinematics and modelling of the elliptical planetary nebula Sa 2-21

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.342..823h&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 342, Issue 3, pp. 823-829.

Astronomy and Astrophysics

Astronomy

3

Ism: Kinematics And Dynamics, Planetary Nebulae: Individual: Sa 2-21

Scientific paper

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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