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Title:
Spatially resolved optical and near-infrared spectroscopy of I ZW 18
Authors:
Skillman, Evan D.; Kennicutt, Robert C., Jr.
Affiliation:
AA(Minnesota Univ., Minneapolis), AB(Steward Observatory, Tucson, AZ)
Publication:
Astrophysical Journal - Part 1 (ISSN 0004-637X), vol. 411, no. 2, p. 655-666. (ApJ Homepage)
Publication Date:
07/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, H II REGIONS, INFRARED SPECTROSCOPY, IRREGULAR GALAXIES, VISIBLE SPECTRUM, ABUNDANCE, EMISSION SPECTRA, LINE SPECTRA, NEAR INFRARED RADIATION
DOI:
10.1086/172868
Bibliographic Code:
1993ApJ...411..655S

Abstract

Long-slit optical and near-IR spectroscopy are presented for the bright NW and faint SE components of the oxygen-poor H II galaxy I Zw 18, yielding physical conditions and O, N, S, and He abundances for these components. All of the elemental abundances for the two components of I Zw 18 are equal (within errors), thereby placing constraints on evolutionary theories for this system.

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