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H2 and HI Emission Line Imaging of the Ring Nebula NGC 6720

Published online by Cambridge University Press:  19 July 2016

M. A. Greenhouse ,
T. L. Hayward  and
H. A. Thronson Jr.
M. A. Greenhouse
Affiliation:
Wyoming Infrared Observatory, University of Wyoming
T. L. Hayward
Affiliation:
Wyoming Infrared Observatory, University of Wyoming
H. A. Thronson Jr.
Affiliation:
Wyoming Infrared Observatory, University of Wyoming

Abstract

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We present infrared emission line images of the v = 1 → 0 S(1) transition of molecular hydrogen and Brγ recombination line of atomic hydrogen which cover the entire extent of NGC 6720, the Ring Nebula. The maps presented here are the highest angular resolution images of these transitions yet produced for this object, and have very low relative positional uncertainty. As a result, we clearly resolve the spatial stratification of the ionized and shocked molecular zones within the nebula discussed previously by Beckwith et al. (1978). The relative spatial distribution of molecular and ionized hydrogen we observe is typical of several planetaries which exhibit shocked H2 emission (eg. see Zuckerman and Gatley 1987), and is similar to that predicted by the interacting-stellar-winds model of planetary nebulae formation (see Volk and Kwok 1985 and references therein).

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 170
Copyright
Copyright © Kluwer 1989 

References

Beckwith, S., Persson, S.E., and Gatley, I., 1978, Ap. J., 219, L33.Google Scholar
Pottasch, S.R. 1984, Planetary Ncbulae, (Dordrecht: Reidel). Schonberner, D. 1983, Ap. J. , 272, 708.Google Scholar
Volk, K. and Kwok, S. 1985, Astr. Ap., 153, 79.Google Scholar
Zuckerman, B. and Gatley, I. 1987, Ap. J., in press.Google Scholar