Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...195..315d&link_type=abstract
Astrophysical Journal, vol. 195, Jan. 15, 1975, pt. 1, p. 315-332.
Astronomy and Astrophysics
Astrophysics
148
Abundance, Emission Spectra, H Ii Regions, Line Spectra, Magellanic Clouds, Astronomical Photometry, Chemical Composition, Hydrogen Ions, Ionized Gases, Luminous Intensity, Spectrophotometry
Scientific paper
The results of an investigation of the optical spectra of three SMC and 11 LMC H II regions are presented. From the emission-line strengths corrected for interstellar reddening, the relative abundances of H, He, N, O, Ne, S, Cl, and Ar are calculated. The effects of temperature and density fluctuations on the abundance results are also discussed. No substantial abundance variation, or gradient, is found among the observed H II regions in each Cloud. Relative to H, the abundances of the elements heavier than He are found to be lower than in nearby galactic H II regions, such as the Orion Nebula. The lower abundances are generally more pronounced for the SMC H II regions. Of the elements considered, N shows the greatest relative deficiency in the H II regions of both Clouds.
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