Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206..293f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Jan. 15, 1984, p. 293-304. Research supported by t
Astronomy and Astrophysics
Astronomy
20
Astronomical Spectroscopy, Planetary Nebulae, Ultraviolet Astronomy, Ultraviolet Spectra, Abundance, Electron Density Profiles, Electron Energy, Interstellar Extinction, Iue
Scientific paper
The authors analyse photoelectric visual and ultraviolet observations of the compact planetary nebula Sw St 1. The electron density, determined from the C III λλ1907/1909 line ratio, is Ne = (1.1±0.1)×105cm-3, consistent with the high emission measure and high critical frequency determined from observations of the thermal radio emission. The C/O abundance ratio in the nebula is found to be N(C)/N(O) = 0.72±0.1, i.e. the envelope is oxygen rich, as suggested by the identification of the silicate feature in the 8 - 13 μm infrared spectrum. Difficulties remain in accurately determining the reddening constant to the nebula and its electron temperature.
Cohen Martin
Flower David R.
Goharji A. A. A.
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