Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1902l&link_type=abstract
American Astronomical Society Meeting 210, #19.02; Bulletin of the American Astronomical Society, Vol. 39, p.119
Other
Scientific paper
We have used archival STIS data in the range 2100-2500 Å toward Trapezium star Θ1 B Orionis to estimate the Fe column density in the neutral veil of Orion. The veil lies 1-3 pc in front of the Orion H+ region, it has an estimated volume density of 102.5-3.5 cm-3, and its H0 column density has been previously measured via the STIS-observed Ly α line. We find N(Fe)/N(H0) = 3.9 ± 1.2 × 10-7, implying a log depletion of -1.9 ± 0.12 relative to solar. Our estimate of N(Fe) comes from a simple analysis of the partially saturated 2249 and 2260 Å Fe II lines; from this analysis, we are also able to estimate empirically new values for the oscillator strengths of the unsaturated 2234 and 2367 Å Fe II lines. N(Fe)/N(H) in the veil is consistent with the most recent estimates of this ratio for the Orion H+ region. Therefore, there is no evidence that Fe has been released from grains into the gaseous state in the H+ region via grain destruction processes. The Fe/H ratio in the veil is also consistent with other Fe/H measurements made in the diffuse ISM for lower density gas. Therefore, the present result does not support the idea that depletion is positively correlated with gas density.
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