Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98l...1f&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 2, May 1981, p. L1-L3.
Astronomy and Astrophysics
Astrophysics
37
Abundance, Interstellar Gas, Nebulae, Nitrogen, Absorption Spectra, Astronomical Catalogs, Gas Density, Interstellar Extinction
Scientific paper
Literature data on the abundance of nitrogen in the diffuse interstellar medium is compiled in order to determine the interstellar depletion of the element and its probable abundance in dust grains. Interstellar N I column densities were derived from Copernicus observations of absorption resonance lines for 21 lines of sight, for which hydrogen column densities were also obtained. A good correlation between the total nitrogen and hydrogen column densities is found, with the log of the nitrogen/hydrogen abundance ratio nearly constant at -4.25 + 0.25 or - 0.3 independant of reddening up to a color excess of 0.3. This value is very close to those found in the sun, early-type stars, and the Orion Nebula, indicating only a very slight nitrogen depletion in the diffuse interstellar medium, if one exists at all.
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