Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201p..39f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Nov. 1982, p. 39P-43P. Research supported by the Science and Engine
Astronomy and Astrophysics
Astronomy
8
Astronomical Spectroscopy, High Dispersion Spectrographs, Planetary Nebulae, Ultraviolet Spectra, Abundance, Calcium, Emission Spectra, Forbidden Bands, Iue, Line Spectra, Neon, Radiant Flux Density, Ultraviolet Astronomy
Scientific paper
High-dispersion IUE spectra of NGC 7662 have been obtained with exposure times optimized for measurement of the relative strengths of the components of: CIV lambda-lambda 1548, 1551; the forbidden line CIII lambda-lambda 1907, 1909 and the forbidden line Ne IV lambda-lambda 2422, 2424. The CIV ratio (lambda 1548)/(lambda 1551) is expected to be 2.00, the ratio of the statistical weights of the emitting levels, and the observed value is within 0.15 of 1.92. The forbidden line CIII and the forbidden line Ne IV ratios depend upon the electron density, Ne, and from the observations it is concluded that Ne for NGC 7662 is in the range 1300 to 5000/cu cm. The presence of the dielectronic recombination line CIII lambda 2297 is established beyond doubt. The absolute calibration of IUE high-dispersion spectra is also discussed.
Flower David R.
Penn C. J.
Seaton M. J.
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