Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...514..296f&link_type=abstract
The Astrophysical Journal, Volume 514, Issue 1, pp. 296-306.
Astronomy and Astrophysics
Astronomy
10
Line: Identification, Planetary Nebulae: Individual (Ngc 40), Stars: Wolf-Rayet, Ultraviolet: General
Scientific paper
A detailed analysis of archival individual and co-added low- and high-dispersion IUE spectra of the planetary nebula NGC 40 has been performed, using NEWSIPS extracted spectra. More than 50 emission lines and numerous absorption features have been identified, and emission-line fluxes and equivalent widths were measured. Terminal wind velocities from P Cygni profiles and electron densities were redetermined. Several inconsistencies were found in earlier works for this peculiar low-excitation planetary that is excited by a 90,000 K ``O VI sequence'' WC8 star. The detection of Fe II lines that are resonantly excited by the O VI lambda1031 line supports the O VI classification for the central star.
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