Other
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12277w&link_type=abstract
HST Proposal ID #12277. Cycle 18
Other
Scientific paper
The line of sight to HD 62542 is remarkable for its unusual UV extinction, high column densities of various molecules {for A_v 1}, and apparent dearth of diffuse atomic gas. Most of the interstellar material resides in a single cold cloud - a small, relatively dense {n_H 500-1000 cm^-3}, molecular knot whose more diffuse outer layers appear to have been stripped away by stellar winds and shocks. As such, it provides an ideal venue for investigating the properties of moderately dense molecular gas - including the production of molecules and growth of grains in such gas - with minimal confusion from any associated diffuse atomic gas. We propose to obtain high resolution, moderately high S/N STIS spectra of C I, CO and its isotopomers, C_2, CS, C II, O I, and many other atomic species {characterized by a wide range in depletion behavior}. Those data will be used to compare various diagnostics of the physical conditions {e.g., C I and O I fine-structure excitation, CO and C_2 rotational excitation}, to determine the relative abundances of the various CO isotopomers {fractionation}, and to determine the depletions of various elements in moderately dense gas {the predicted severe depletions have likely been masked by associated diffuse gas in other cases}. Understanding the fractionation and excitation of CO in this relatively simple case will aid in understanding its behavior in other more complex regions {important because CO and its isotopomers are often used to trace and characterize molecular gas where H_2 cannot be directly measured}.;
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