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The Structure of NGC 6720: The Ring Nebula in Lyra

Published online by Cambridge University Press:  22 September 2016

P.D. Atherton ,
T.R. Hicks ,
N.K. Reay ,
S.P. Worswick  and
W. Hayden Smith
P.D. Atherton
Affiliation:
Astronomy Group, Blackett Laboratory, Imperial College, London SW7 2BZ
T.R. Hicks
Affiliation:
Now at McDonnell Center for Space Sciences, Washington University, St. Louis, Missouri
N.K. Reay
Affiliation:
Astronomy Group, Blackett Laboratory, Imperial College, London SW7 2BZ
S.P. Worswick
Affiliation:
Astronomy Group, Blackett Laboratory, Imperial College, London SW7 2BZ
W. Hayden Smith
Affiliation:
of McDonnel Center for Space Sciences

Extract

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New observations have been made of the [OIII] 5007Å ine profile from the central and outer regions of 6720 in order to study in detail the radial velocity structure of the nebula. This data was obtained using a Fabry-Perot Interferometer working at a resolution of 67,000. The line profile is clearly s p l i t in the centre indicating the presence of a gaseous envelope surrounding, and in radial expansion from, the central star at avelocity of 25 ±5 km/sec. Irregularities in the emission intensities indicate local patchiness in this shell.

Type
Session VI: Evolution and Morphology of Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 76: Planetary Nebulae , 1978 , pp. 290 - 291
Copyright
Copyright © Reidel 1978