Computer Science – Sound
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..415b&link_type=abstract
Astrophysical Journal, vol. 202, Dec. 1, 1975, pt. 1, p. 415-420.
Computer Science
Sound
42
Astronomical Spectroscopy, Interstellar Extinction, Line Spectra, Planetary Nebulae, Ultraviolet Spectra, Astronomical Models, Granular Materials, Radiant Flux Density, Rocket Sounding, Rocket-Borne Instruments, Stellar Spectra, Telescopes, Ultraviolet Radiation
Scientific paper
An ultraviolet spectrum of NGC 7027, obtained with a rocket-borne telescope, is analyzed. Absolute values are presented for the observed fluxes, and upper limits are given for the strongest predicted lines that were not observed. The results are corrected for interstellar extinction using the observed and calculated line ratios between H-beta and the hydrogenic recombination line of He II at 1640 A. The corrected C IV resonance line at 1549 A is found to be in good agreement with the intensity calculated from models, but the intercombination line of C III at 1909 A is found to be too bright by a factor of 10. This discrepancy is reduced to a factor of 4 by taking dielectric recombination into account and is eliminated by using the solar carbon abundance, which implies attenuation in the C IV line. It is shown that no appreciable number of absorbing grains can exist in the C IV-producing region of the nebula since the optical depth is of the order of 10,000 at the line center.
Bohlin Ralph Charles
Marionni P. A.
Stecher Theodore P.
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