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FUSE Observations of Interstellar Gas toward the SMC Star Sk 108

By C. Mallouris, D. E. Welty, D. G. York, H. W. Moos, K. R. Sembach, S. D. Friedman, E. B. Jenkins, M. Lemoine, W. R. Oegerle, B. D. Savage, J. M. Shull, G. Sonneborn, A. Vidal-madjar and Meudon Place Jules Janssen


We discuss the interstellar absorption lines found in FUSE spectra of the Wolf-Rayet binary Sk 108, located in the northeastern part of the main “bar ” of the Small Magellanic Cloud. The spectra cover the wavelength range 988 − 1187 ˚A, at a resolution of about 12,000 and S/N of 20–40. We use detailed component information from higher resolution near-UV and optical spectra to model the far-UV lines of similarly distributed species. Both the Galactic and SMC gas toward Sk 108 seem to be predominantly neutral, though a significant fraction of the SMC gas is ionized. The column densities of P II, S II, and Ar I are consistent with essentially solar ratios, relative to N(Zn II), in both the Galactic and SMC gas; the column density of N I remains somewhat uncertain. Molecular hydrogen is present in the Galactic gas, with properties similar to those found in low mean density Galactic lines of sight and in the Galactic gas toward several other LMC and SMC stars. We report a tentative detection of H2 in the SMC gas

Year: 2001
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