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- W2114860619 abstract "We present the analysis of FUSE observations of the metal-deficient dwarf galaxy I Zw 18. We measured column densities of H i, N i, O i, Ar i, Si ii, and Fe ii. The O i/H i ratio ($log$(O i/H i$)=-4.7^{+0.8}_{-0.6}$) is consistent with the O/H ratio observed in the H ii regions (all uncertainties are 2- σ ). If the oxygen is depleted in the H i region compared to the H ii regions, the depletion is at most 0.5 dex. This is also consistent with the $log$(O/H) ratios ~-5 measured with FUSE in the H i regions of other blue compact dwarf galaxies. With $log$(N i/O i$)=-2.4^{+0.6}_{-0.8}$, the measured N i/O i ratio is lower than expected for primary nitrogen. The determination of the N ii column density is needed to discriminate between a large ionization of N i or a possible nitrogen deficiency. The neutral argon is also apparently underabundant, indicating that ionization into Ar ii is likely important. The column densities of the other α -chain elements Si ii and Ar i favor the lower edge of the permitted range of O i column density, $log (N_{rm cm^{-2}}$(O i$))sim 16.3$." @default.
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- W2114860619 date "2003-12-17" @default.
- W2114860619 modified "2023-10-18" @default.
- W2114860619 title "<i>FUSE</i>observations of the $ion{H}{I}$ interstellar gas of I Zw 18" @default.
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- W2114860619 doi "https://doi.org/10.1051/0004-6361:20031518" @default.
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