Extended red emission from dust in planetary nebulae

Details Extended red emission from dust in planetary nebulae Extended red emission from dust in planetary nebulae

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386..587f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 20, 1992, p. 587-603. Research supported by Kitt Peak National Ob

Astronomy and Astrophysics

Astrophysics

52

Cosmic Dust, Interstellar Extinction, Interstellar Matter, Light Emission, Planetary Nebulae, Continuous Radiation, Spectrophotometry, Visible Spectrum, Wavelengths

Scientific paper

Results are presented of a long-slit spectrophotometric survey of the optical continuum emission of 20 PNs covering a wide range of C/O ratios, and the detection of the broad red-emission band known as extended red emission (ERE) in seven of these objects is reported. In PNs where ERE is detected, the band is found to have an average integrated intensity of 0.0019 erg/sq cm/s/sr and to contribute approximately 15 percent of the flux in the continuum between 550 and 820 nm. The ERE band observed in planetary nebulae is compared to the ERE band observed in reflection nebulae; they are found to be similar in band profile and intensity. It is discovered that the presence or absence of ERE in PNs is correlated with the C/O ratio in the sense that none of the oxygen-rich nebulae in this sample exhibit the ERE band above the present detection limit, while most carbon-rich nebulae do. It is claimed that this supports the identification of ERE as the photoluminescence of hydrogenated amorphous dust grains.

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