Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....81..121p&link_type=abstract
Astronomy and Astrophysics, vol. 81, no. 1-2, Jan. 1980, p. 121-127.
Astronomy and Astrophysics
Astrophysics
25
Abundance, Cosmic Dust, Magnesium, Planetary Nebulae, Carbon, Chemical Composition, Evaporation, Gas Temperature, Ionized Gases, Line Spectra, Photoionization, Radiant Heating, Sputtering, Stellar Mass Ejection
Scientific paper
A comparison of the Mg II and [Mg V] lines, recently observed in the infrared and ultraviolet spectra of the planetary nebula NGC 7027, allows to establish that the gaseous magnesium abundance is at least cosmic in the inner part of the nebula and is lower by about one order of magnitude in the outer part. The depletion is attributed to the locking of magnesium into dust grains.
After discussing the processes that may lead to this surprising effect, it is concluded that a selective destruction of metallic magnesium grains by radiation heating during an earlier phase of the nebula expansion is the most likely explanation. This provides a new evidence that the parent-star expelled a gas enriched in carbon.
Incidentally, the absence of any detectable iron-rich inner zone provides an upper limit of a few 10-7 Msun/yr for the wind from the hot central star.
Pequignot Daniel
Stasinska Grazina
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