Abundance variations in the planetary nebula A 78

Details Abundance variations in the planetary nebula A 78 Abundance variations in the planetary nebula A 78

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..128m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 1, Feb. 1988, p. 128-136.

Astronomy and Astrophysics

Astrophysics

21

Abundance, Planetary Nebulae, Stellar Spectra, Data Reduction, Electron Density (Concentration), Electron Energy, Helium, Nitrogen, Oxygen

Scientific paper

The authors present long slit low dispersion flux calibrated spectra for the planetary nebula A 78, and from these they obtain the chemical abundances and their variation within the nebula. In the central part of the nebula almost no hydrogen is found implying that the envelope of the central star is burning helium. The authors also measured an over-abundance of processed material which has been convected from the centre of the star. In the outer part of the nebula the abundances are close to solar.

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