Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-27
Astrophys.J.654:955-970,2007
Astronomy and Astrophysics
Astrophysics
Accepted in The Astrophysical Journal, 9/2006 (expected pub. date: 1/2007) 38 pages, 5 figures (4 color)
Scientific paper
10.1086/509096
We report on the abundance of interstellar neutral nitrogen (NI) for 30 sightlines, using data from the Far Ultraviolet Spectroscopic Explorer (FUSE) and the Hubble Space Telescope (HST). NI column densities are derived by measuring the equivalent widths of several ultraviolet absorption lines and subsequently fitting those to a curve of growth. We find a mean interstellar N/H of 51+/-4 ppm. This is below the mean found by Meyer et al. of 62(+4,-3) ppm (adjusted for a difference in f-values). Our mean N/H is similar, however, to the (f-value adjusted) mean of 51+/-3 ppm found by Knauth et al. for a larger sample of sightlines with larger hydrogen column densities comparable to those in this study. We discuss the question of whether or not nitrogen shows increased gas-phase depletion in lines of sight with column densities log(H_tot) >~ 21, as claimed by Knauth et al. The nitrogen abundance in the line of sight toward HD 152236 is particularly interesting. We derive very small N/H and N/O ratios for this line of sight that may support a previous suggestion that members of the Sco OB1 association formed from an N-deficient region.
Jensen Adam G.
Rachford Brian Lee
Snow Theodore P.
No associations
LandOfFree
Is There Enhanced Depletion of Gas-Phase Nitrogen in Moderately Reddened Lines of Sight? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Is There Enhanced Depletion of Gas-Phase Nitrogen in Moderately Reddened Lines of Sight?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Is There Enhanced Depletion of Gas-Phase Nitrogen in Moderately Reddened Lines of Sight? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-448002