Astronomy and Astrophysics – Astronomy
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196...31s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 196, no. 1-2, May 1988, p. 31-38.
Astronomy and Astrophysics
Astronomy
62
Abundance, Astronomical Photometry, Dwarf Galaxies, H Ii Regions, Irregular Galaxies, Oxygen, Interstellar Extinction, Local Group (Astronomy), Spectrophotometry
Scientific paper
Optical spectrophotometry of an H II region in the low-luminosity Local Group Galaxy GR 8 is presented. The oxygen abundance is found to be 2.7 x 10 to the -5th or about 0.03 of the solar value. Within errors, this is equal to the oxygen abundance of I Zw 18, the lowest abundance H II region known. The low mass and low oxygen abundance of GR 8 confirm that there is a good correlation between oxygen abundance and total galaxy mass for irregular galaxies. The excitation region in this H II region is low, resulting in a significant ionization correction factor for determining the total helium abundance. This renders GR 8 unsuitable for the derivation of the primordial helium abundance.
Melnick Jorge
Moles Mariano
Skillman Evan D.
Terlevich Robert
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