期刊
ASTROPHYSICAL JOURNAL
卷 724, 期 1, 页码 791-798出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/724/1/791
关键词
galaxies: abundances; galaxies: individual (SBS 0335-052); galaxies: ISM; H II regions; ISM: abundances
资金
- DGAPA (UNAM, Mexico) [PAPIIT IN123309]
- CONACyT (Mexico) [46904]
We derive the Mg/H ratio in the Orion nebula and in 30 Doradus. We also derive the O/H and the Fe/O ratios in the extremely metal-poor galaxy SBS 0335-052 E. We estimate the dust depletions of Mg, Si, and Fe in Galactic and extragalactic H II regions. From these depletions we estimate the fraction of O atoms embedded in dust as a function of the O/H ratio. We find an increasing depletion of O with increasing O/H. The O depletion increases from about 0.08 dex, for the metal poorest H II regions known, to about 0.12 dex, for metal-rich H II regions. This depletion has to be considered to compare nebular with stellar abundances.
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