Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..290m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 2, Aug. 1987, p. 290-298.
Astronomy and Astrophysics
Astronomy
13
Emission Spectra, Infrared Astronomy, Interstellar Matter, Planetary Nebulae, Carbon, Cosmic Dust, Near Infrared Radiation, Oxygen, Spectrophotometry
Scientific paper
Absolute fluxes and relative intensities of the 3.3-micron and 3.4-micron features in 12 planetary nebulae have been derived from low-resolution spectroscopy and narrow-band photometry. In addition, the near-infrared continuum fluxes in excess of the expected recombination spectrum of hydrogen and helium have been determined. The 3.3-micron feature is present in all 12 objects of the sample. In 4 out of 10 planetaries, the 3.4-micron feature could not be detected with the circular variable filter spectroscopy. A corelation study shows both features to be associated with the 12-100-micron emission. Only the 3.3-micron feature is correlated to the excess radiation at 3.8 microns and to the gas-phase carbon abundance. The oxgyen abundance is anticorrelated to the 3.3-micron and 3.4-micron features. The intensities of both are approximately inversely proportional to the nebula's distance from the galactic plane. The data are interpreted in terms of the recent hypothesis on polycyclic aromatic hydrocarbons.
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