The remarkable ultraviolet spectrum of the planetary nebula Abell 30

Details The remarkable ultraviolet spectrum of the planetary nebula Abell 30 The remarkable ultraviolet spectrum of the planetary nebula Abell 30

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..716h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 716-724.

Astronomy and Astrophysics

Astrophysics

36

Astronomical Spectroscopy, Planetary Nebulae, Stellar Evolution, Stellar Mass Ejection, Ultraviolet Spectra, Abundance, Chemical Composition, Coulomb Collisions, Electron Scattering, Gas Heating, Iue, Line Spectra, Radiant Flux Density, Stellar Winds

Scientific paper

Abell 30 has been identified as a planetary nebula in which the nucleus has experienced a final helium shell flash after ejection of the original, outer envelope. Around the central star of the nebula, four knots of material are observed. In view of the importance of the chemical composition of the ejected material for studies of advanced stages of stellar evolution, clarification of the physical conditions in the knots is vital. Data obtained of Abell 30 with the aid of the International Ultraviolet Explorer (IUE) satellite are discussed along with aspects of extinction, the He II flux, ionic abundances, the C II lambda 4267 line, questions regarding the existence of a carbon-rich core in the knot, the heating of the nebular gas, the central star, and heating by suprathermal particles from the stellar wind. The UV spectrum of the inner nebulosity of Abell 30 indicates that an extraordinary amount of energy is being deposited in the gas.

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