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The Structure of NGC 6720: The Ring Nebula in Lyra
1978
Symposium - International astronomical union
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.
doi:10.1017/s0074180900143177
fatcat:p52jy4ysc5hcbmhexvthysrvsy