1979•Publications of the Astronomical Society of the PacificOpen access

The peculiar planetary nebula M 4-18.

F. Sabbadin, A. Bianchini

Abstract

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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Key concepts: Planetary nebula, Emission nebula, Nebula, Physics, Astrophysics, Doubly ionized oxygen, Emission spectrum, Bipolar nebula