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Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919804j&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #198.04; Bulletin of the American Astronomical Society,
Other
Scientific paper
The introduction of UV instruments with higher resolution and/or throughput, namely FUSE and STIS, has allowed for a new generation of elemental abundance studies in the interstellar medium over the past several years. In my thesis I have undertaken studies of interstellar nitrogen, oxygen, magnesium, silicon, and iron. The results of these and other studies have confirmed that the line of sight parameter with the most significant correlation to the depletion of most elements is the average hydrogen volume density. However, my work has shown that correlations with other line of sight parameters do exist, in particular between depletions and extinction (both total visual extinction and selective extinction, particularly when either is scaled by the pathlength of the line of sight), the ratio of total visual extinction to selective extinction (a measure of average grain size), and the molecular fraction of hydrogen. While these trends hold in lines of sight with up to a few magnitudes of visual extinction and densities over 10 cm-3, we have yet to see the more extreme depletions expected to be associated with translucent clouds. In my talk, I will summarize the results of my studies and other similar studies, as well as the current state of "cosmic" abundance standards. I will also discuss the implications of these results for the physical conditions of interstellar clouds and dust composition. Finally, I will discuss the implications of these results and other results--such as the detection of very weak lines in my work--for future work with the next important UV instrument, the Cosmic Origins Spectrograph, which is expected to be installed on HST in late 2007 or early 2008.
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