The velocity structure of the bipolar planetary nebula NGC 2346

Details The velocity structure of the bipolar planetary nebula NGC 2346 The velocity structure of the bipolar planetary nebula NGC 2346

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..613w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 2, Aug. 1991, p. 613-623.

Astronomy and Astrophysics

Astrophysics

18

Astronomical Spectroscopy, Binary Stars, Morphology, Planetary Nebulae, Forbidden Transitions, H Alpha Line, Nitrogen Ions, Oxygen Ions, Spatial Distribution

Scientific paper

The morphological and kinematic structure of the binary star bipolar planetary nebula NGC 2346 is studied using new spectroscopic and imaging observations. A deep prime focus plate has been obtained and reveals for the first time the extent of the nebula; its length is about 140 arcsec (0.5 pc for a distance of 700 pc). The bipolar lobes appear to form closed ellipses projected on the sky. The velocity structure at H-alpha, forbidden N II, and Forbidden O III has been observed at seven long slit positions with the Manchester Echelle Spectrograph. The Forbidden N II velocity structure is dominated by emission from a thin shell, but there is also amorphous emission from inside the shell visible at H-alpha and Forbidden O III. At the extremity of each lobe the two velocity components appear to join up in velocity indicating that the lobes are closed shells. The morphology and kinematics have been simply modeled by a thin shell formed of two ellipsoids separated by a distance less than their major axis diameter and the long axis of the structure tilted by 60 deg to the line of sight.

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