SIMBAD references

2003ApJ...596L..51K - Astrophys. J., 596, L51-L54 (2003/October-2)

Potential variations in the interstellar N I abundance.

KNAUTH D.C., ANDERSSON B.-G., McCANDLISS S.R. and MOOS H.W.

Abstract (from CDS):

We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph observations of the weak interstellar N I λ1160 doublet toward 17 high-density sight lines [N(Htot)≥1021 cm–2]. When combined with published data, our results reveal variations in the fractional N I abundance showing a systematic deficiency at large N(Htot). At the FUSE resolution (∼20 km/s), the effects of unresolved saturation cannot be conclusively ruled out, although O I λ1356 shows little evidence of saturation. We investigated the possibility that the N I variability is due to the formation of N2in our mostly dense regions. The 0-0 band of the c'41Σ+u-X1Σ+gtransition of N2at 958 Å should be easily detected in our FUSE data; for 10 of the denser sight lines, N2is not observed at a sensitivity level of a few times 1014 cm–2. The observed N I variations are suggestive of an incomplete understanding of nitrogen chemistry.

Abstract Copyright:

Journal keyword(s): ISM: Abundances - ISM: Atoms - ISM: Clouds - Ultraviolet: ISM

Simbad objects: 26

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