Journal
ASTROPHYSICAL JOURNAL
Volume 568, Issue 2, Pages 679-688Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/339032
Keywords
galaxies : abundances; galaxies : individual (M33); HII regions; infrared : galaxies
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We present neon abundances for 25 H II regions of M33, measured from line profiles of the mid-infrared transitions of [Ne II] and [Ne III] taken with the Infrared Space Observatory Short-Wavelength Spectrometer. The distribution of neon abundances as a function of galactocentric radius is best described as a step, -0.15 dex relative to the solar neon abundance from 0.7 to 4.0 kpc and -0.35 dex from 4.0 to 6.7 kpc, with estimated intrinsic scatter of 0.07 dex. The nearly at neon abundance distribution differs from the steep oxygen abundance gradient found by previous investigators. Unless the oxygen abundance determinations are wrong, the chemical evolution of the galaxy has been radially dependent.
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