Far Ultraviolet Spectroscopic Explorer Observations of Interstellar Gas toward the Small Magellanic Cloud Star Sk 108

Details Far Ultraviolet Spectroscopic Explorer Observations of Interstellar Gas toward the Small Magellanic Cloud Star Sk 108 Far Ultraviolet Spectroscopic Explorer Observations of Interstellar Gas toward the Small Magellanic Cloud Star Sk 108

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...558..133m&link_type=abstract

The Astrophysical Journal, Volume 558, Issue 1, pp. 133-144.

Astronomy and Astrophysics

Astronomy

22

Galaxies: Abundances, Galaxies: Ism, Ism: Abundances, Galaxies: Magellanic Clouds, Stars: Individual (Sk 108)

Scientific paper

We discuss the interstellar absorption lines found in Far Ultraviolet Spectroscopic Explorer spectra of the Wolf-Rayet binary Sk 108, which is located in the northeastern part of the main ``bar'' of the Small Magellanic Cloud. The spectra cover the 988-1187 Å wavelength range at a resolution of about 12,000 and a signal-to-noise ratio 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, although 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 for J=1 and 3, with rotational level populations consistent with an excitation temperature on the order of 1000 K-similar to the H2 found in diffuse Galactic gas toward ζ Puppis. Strong absorption from N III, S III, and Fe III has revealed a significant ionized component, particularly in the SMC; O VI is present, but relatively weak, especially in the Galactic gas. The N(C IV)/N(O VI) ratio varies somewhat within the SMC, suggesting that several processes may contribute to the observed high ion abundances.

Affiliated with

Also associated with

No associations

Rating

Far Ultraviolet Spectroscopic Explorer Observations of Interstellar Gas toward the Small Magellanic Cloud Star Sk 108 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Far Ultraviolet Spectroscopic Explorer Observations of Interstellar Gas toward the Small Magellanic Cloud Star Sk 108, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Far Ultraviolet Spectroscopic Explorer Observations of Interstellar Gas toward the Small Magellanic Cloud Star Sk 108 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1484226