The peculiar planetary nebula M4-18.

Details The peculiar planetary nebula M4-18. The peculiar planetary nebula M4-18.

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..276s&link_type=abstract

Publications of the Astronomical Society of the Pacific, Vol. 91, p. 276 - 277

Astronomy and Astrophysics

Astronomy

6

Planetary Nebulae:Spectra

Scientific paper

The spectrum of the planetary nebula M4-18 (146+7°1, Perek and Kohoutek 1967) consists of broad emission lines of C II, C III and C IV of the central star superimposed on the emission lines of H I, [N II], and [S II] of the nebula. The [O III] emission lines λλ4959-5007 are very weak, a rather atypical case among planetary nebulae. The similarity of M4-18 to BD +30°3639 (Campbell's star) is discussed.

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