Abundance variations in the planetary nebula A 78

Bibcode
1988A&A...191..128M
Manchado, A.; Mampaso, A.; Pottasch, S. R.
Bibliographical reference

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

Advertised on:
2
1988
Number of authors
3
IAC number of authors
2
Citations
28
Refereed citations
24
Description
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.
Type
Refereed
Planetary nebulae

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