High-resolution spectroscopy and direct imaging of the dwarf galaxy I ZW 18

Details High-resolution spectroscopy and direct imaging of the dwarf galaxy I ZW 18 High-resolution spectroscopy and direct imaging of the dwarf galaxy I ZW 18

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1591d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1591-1599.

Astronomy and Astrophysics

Astronomy

42

Astronomical Spectroscopy, Dwarf Galaxies, Absorption Spectra, Abundance, Charge Coupled Devices, Faint Objects, H Alpha Line, Red Shift

Scientific paper

Observations of the velocity profile of H-alpha emission in I Zw 18 suggest that the ionized gas may form an incomplete shell, ring, or double structure several arcsec across. Several faint continuum objects are noted along a line extending 1.5 arcsec northwest of the bright condensations in I Zw 18. Results are presented for the effect of Galactic interstellar Na I 5890-A absorption on the redshifted He I 5876-A emission from I Zw 18. A helium abundance of about 0.234 + or - 0.016 is implied for this object.

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