Abundances in the diffuse interstellar medium

Astronomy and Astrophysics – Astronomy

Scientific paper

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Abundance, Interstellar Chemistry, Interstellar Gas, Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Depletion, Oao 3, Ultraviolet Spectra

Scientific paper

Interstellar absorption line data obtained with the Copernicus and IUE satellites were used to study interstellar gas. It is established that certain elements, generally those with high condensation temperatures, are substantially under-abundant in the gas phase relative to total solar or cosmic abundances. This depletion of elements is due to the existence of solid material in the form of dust grains in the interstellar medium. However, surveys indicate that even volatile elements such as Zn and S are significantly depleted in many sight lines; a result which may shed light on the question of the relative importance of circumstellar envelopes of evolved stars and interstellar clouds as sites of grain formation. Developments in this field made possible by the large base of UV interstellar absorption line data are reviewed and the implications of the results for understanding of the physical processes governing depletion are discussed.

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