Interstellar abundances in the zeta Ophiuchi clouds
Journal Article
·
· Astrophys. J.; (United States)
Ultraviolet interstellar absorption line profiles observed toward zeta Oph with Copernicus have been analyzed for velocity component structure, yielding column densities for the ions Mg II, P II, Mn II, and Fe II separately for two principal components. Despite a ratio of hydrogen column densities of nearly a factor of 200, the less massive cloud has comparable or greater column densities of these elements, indicating that little or no depletion exists in the secondary component. Since this cloud has a moderately high velocity, it is likely that the grain mentles have been sputtered off as a result of the cloud acceleration mechanism, probably a shock front. There is residual depletion of calcium and titanium in this shocked cloud, which may provide useful data on the nature of the grain surfaces and the binding energies of various elements to the grains. Consideration of the relative abundances of neutral atoms in the low-velocity cloud leads to a derivation of larger depletions for iron and manganese than those derived from the profile analysis. This may be understood if this cloud has differential depletion within it, so that the densest portion has the greatest depletion; or if these ions are ionized by some process which is faster than photoionization.
- Research Organization:
- Laboratory for Atmospheric and Space Physics and Department of Physics and Astrophysics, University of Colorado
- OSTI ID:
- 6251541
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 229:2; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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