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astro-ph.SR2022★ 3 cited
The [S II] Spectral Images of the Planetary Nebula NGC 7009: II. Major Axis
Siek Hyung, Seong-Jae Lee, Masaaki Otsuka
We derived position-velocity density distribution diagrams along the major (PA = 77) axis of the elliptical planetary nebula NGC 7009 with the Keck HIRES [SII] 6716/6731…
astro-ph.SR2022★ 3 cited
Double Shells of the Planetary Nebula NGC 7009 Minor Axis
Seong-Jae Lee, Siek Hyung, Masaaki Otsuka
We analyzed the minor axis spectra of the elliptical planetary nebula (PN) NGC 7009 observed with the Keck HIRES with a 0.862 10 slit placed at about 7.5 an…