Abundance studies of oxygen and nitrogen in nebulae - Uses of the far-infrared emission lines

Astronomy and Astrophysics – Astronomy

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Abundance, Infrared Astronomy, Infrared Spectroscopy, Nebulae, Nitrogen, Oxygen, Emission Spectra, Forbidden Bands, Milky Way Galaxy, Oxygen Spectra

Scientific paper

The potential of infrared forbidden emission lines for studying nebular abundances is discussed, with emphasis on the far-infrared fine-structure lines of oxygen and nitrogen. Observations of these transitions provide fundamentally new diagnostics of the physical conditions in ionized nebulae, and make it possible for the first time to study the abundances of these species in the inner parts of the Galaxy. These new tools for nebular abundance studies are only beginning to be exploited. The results derived so far from such studies are reviewed, and future prospects and applications of these techniques are discussed.

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