Other
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203.1079r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, June 1983, p. 1079-1085, 1087-1098.
Other
22
Astronomical Spectroscopy, Kinematics, Oxygen Spectra, Planetary Nebulae, Astronomical Maps, H Alpha Line, Line Spectra, Radial Velocity, Stellar Envelopes, Three Dimensional Models
Scientific paper
Spectra, described as seeing-limited, of the forbidden O III 5007 A line at a velocity resolution of 18 km/s over the envelope of Abell 30 are obtained. Individual ansae are shown to be moving, relative to the star, with a line-of-sight velocity of 22-25 km/s. It is shown that two of the four ansae identified previously (Jacoby, 1979; Hazard et al., 1980), form a pair, expanding symmetrically with respect to the star with a line-of-sight velocity component (radial flow velocity) of + or - 25 km/s. The brighter of the other two ansae possesses a radial flow velocity of +22 km/s; the symmetric disposition of these ansae about the star (Jacoby, 1979) is seen as indicating that these also form a symmetrically expanding pair. Attention is then given to seeing-limited two-dimensional kinematic data for th H-alpha 6536 A and forbidden N II 6583 A lines obtained across the planetary nebula NGC 2392 using a wide field imaging Fabry-Perot interferometer. The data are used to construct a three-dimensional model for the nebula showing it to comprise two concentric spheroidal shells viewed along their major axes. The inner shell has an axial ratio of 2 and is expanding at a velocity of 65 km/s. Defined by the condensations, the outer shell possesses an axial ratio greater than or equal to 1 and a maximum expansion velocity of approximately 75 km/s.
Atherton P. D.
Reay N. K.
Taylor Karen
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