Spectroscopic observations of the compact planetary Nebula M 4-18

Details Spectroscopic observations of the compact planetary Nebula M 4-18 Spectroscopic observations of the compact planetary Nebula M 4-18

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..216s&link_type=abstract

Astronomy and Astrophysics, vol. 84, no. 1-2, Apr. 1980, p. 216-219. Research supported by the Consiglio Nazionale delle Ricerc

Astronomy and Astrophysics

Astrophysics

10

Abundance, Astronomical Spectroscopy, Planetary Nebulae, Spectroscopic Analysis, Chemical Composition, Electron Density (Concentration), Electron Energy, Helium, Nitrogen, Oxygen, Stellar Spectra

Scientific paper

The spectrum of the compact Planetary Nebula M 4-18 mimics that of BD + 30 deg 3639 (Campbell's star) and, at the same time, is atypical among Planetary Nebulae. The abundance determination indicates that M 4-18 is under-abundant in N, O, and, probably, in He with respect to Planetary Nebulae in the solar neighbourhood, in agreement with the observations of chemical composition gradients across the disk of the galaxy.

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