An investigation of the 3-mu m emission bands in planetary nebulae
Spectra are presented of 21 planetary nebulae spanning the well-known, but still unidentified, narrow emission features at 3.2-3.6 μm. The equivalent width of the 3.29-μm emission band is strongly correlated with the gas-phase carbon-to-oxygen ratio, as expected for a band origin in carbon-rich grai...
| Autori principali: | , , , , |
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| Natura: | Journal article |
| Lingua: | English |
| Pubblicazione: |
1996
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