Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..282g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 282-297. Research supported by the Robert A. Welch Fo
Astronomy and Astrophysics
Astrophysics
123
Abundance, H Ii Regions, Nebulae, Star Formation, Sulfur, Charge Coupled Devices, Chemical Evolution, Electron Energy, Emission Spectra, Nuclear Fusion, Photoionization
Scientific paper
A long-slit CCD survey of forbidden S III 9069, 9532 A radiation in 13 extragalactic H II regions is presented, and the data are used to study the variation of S/O as a function of O/H. The data are consistent with the idea that S/O remains constant as O/H varies. There is no evidence that S/O is larger at low O/H. Photoionization models confirm that observations of O(+)/O(2+) and S(+)/S(2+) can be used to estimate the effective temperature of the ionizing stars in an H II region. This provides a potentially powerful new tool for studying the ionizing stars of H II regions in external galaxies. However, the models fail to reproduce the S(+)/S(2+) ratio in nebulae with large O(2+) fractions for reasonable values of T(eff). Simple chemical evolution models are calculated to compare observations with expectations from stellar neucleosynthesis calculations.
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