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PAH's and Crystalline Silicates in Planetary Nebulae

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Abstract

An overview is given of the PAH and crystalline silicate emissions seen in the SWS guaranteed-time programme on planetary nebulae. Of the 9 objects on which good continuum measurements were obtained above 29 µm, 7 show evidence of olivine emission at 33.5 µm. PAH emission is seen in 5 of these objects, 3 objects show both PAH's and olivines. The presence of both types of features in a single object points to separate carbon-rich and oxygen-rich episodes of mass ejection. The spectrum of the nebula NGC 6302 shows a wealth of features in the range between 20 and 45 µm, many of which can be identified with olivines or pyroxenes.

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  1. SRON, P.O. Box 800, NL-9700 AV, Groningen, the Netherlands

    D.A. Beintema

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  1. D.A. Beintema
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Beintema, D. PAH's and Crystalline Silicates in Planetary Nebulae. Astrophysics and Space Science 255, 507–512 (1997). https://doi.org/10.1023/A:1001532209453

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