The Bipolar Symmetry of Ring-Like Planetary Nebulae: H_2 Imaging at 2.122 microns with the Kitt Peak Cryogenic Optical Bench

Details The Bipolar Symmetry of Ring-Like Planetary Nebulae: H_2 Imaging at 2.122 microns with the Kitt Peak Cryogenic Optical Bench The Bipolar Symmetry of Ring-Like Planetary Nebulae: H_2 Imaging at 2.122 microns with the Kitt Peak Cryogenic Optical Bench

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5605k&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #56.05; Bulletin of the American Astronomical Society, Vol. 24, p.1213

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Scientific paper

The presence of 2 microns H_2 emission in planetary nebulae (PNe) has been shown to be correlated with bipolar or bow-tie morphology (Zuckerman and Gatley 1988, ApJ 324, 501). However, other PNe with circularly or elliptically symmetric morphology in the optical, such as NGC 6720 (the Ring Nebula), also possess regions of shocked H_2. Faint optical halos around this and other Ring-like PNe have posed additional puzzles as to their structure and evolution (Balick et al. 1992 ApJ 392, 582; Zuckerman and Gatley). To investigate the relationship between H_2 morphology, optical halos, and the structure of PNe, we used the new Cryogenic Optical Bench (COB) at Kitt Peak National Observatory to obtain images of representive objects in the 2.122 v=1 -> 0, S(1) line of H_2. These images demonstrate that faint H_2 emission is present in NGC 6720 and in the bipolar NGC 2346 on size scales similar to that of their optical halos. We also find that Ring-like NGC 6781 and NGC 6772 possess faint bipolar lobes of H_2 that are oriented perpendicular to the major axes of the primary nebulae; and that whereas NGC 7027 is Ring-like in ionized emission, it is a bipolar nebula in H_2. We argue that these PNe represent a sequence of bipolar nebulae viewed at inclination angles ranging from nearly perpendicular to the polar axis (NGC 2346) through oblique (e.g. NGC 7027) to nearly pole-on (NGC 6720).

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