Extended filamentary structures in the halo of the Lyra planetary nebula NGC 6720

Details Extended filamentary structures in the halo of the Lyra planetary nebula NGC 6720 Extended filamentary structures in the halo of the Lyra planetary nebula NGC 6720

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178..319m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 319-321.

Astronomy and Astrophysics

Astrophysics

11

Halos, Lyra Constellation, Planetary Nebulae, Astronomical Photography, Stellar Structure

Scientific paper

Very deep, photographic, narrow band images of the Ring planetary nebula, NGC 6720, have revealed the presence of a further extended filamentary structure in its halo. The morphology of this structure consists of fractured, concentric filaments that indicate the existence of several spheroidal shells of gas. The narrow band filters employed in this study show that the loop filaments present in the halo structure discovered by Duncan (1937) are related mainly to the [N II] emission.

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