Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205..417c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Oct. 1983, p. 417-434. Research supported by the S
Astronomy and Astrophysics
Astronomy
48
Astronomical Spectroscopy, Planetary Nebulae, Ultraviolet Astronomy, Visible Spectrum, Abundance, Emission Spectra, Interstellar Extinction, Iue, Line Spectra, Wolf-Rayet Stars
Scientific paper
Optical and IUE spectra of a bright region of nebulosity in the planetary nebula NGC 40 have been combined for an analysis of the physical conditions and abundances in the nebula. Resulting abundances are typical of planetary nebulae and indicate that the nebulosity does not share the extreme abundances of the Wolf-Rayet WC8 central star. The continuum observed in the IUE spectra at an offset position can be fitted well to a calculated nebular continuum; the nebular lines are measured relative to the continuum and hence put on the same scale as optical lines measured relative to H-beta. The absence of stellar features in the offset spectra show that the optical depth for scattering by dust is less than 0.06. The emission in CIV wavelength 1549 from the nebula is anomalously strong. It may be explained, in part, as due to resonance scattering of radiation from the star or from the inner part of the nebula. New recombination lines of CII are identified in IUE spectra; their intensities relative to CII wavelengths 4267, 7230 in NGC 40 and IC 418 are analyzed.
Clegg Robin E. S.
Peimbert Manuel
Seaton M. J.
Torres-Peimbert Silvia
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