ON THE O/H, Mg/H, Si/H, AND Fe/H GAS AND DUST ABUNDANCE RATIOS IN GALACTIC AND EXTRAGALACTIC H II REGIONS

被引：96
|
作者：
Peimbert, Antonio [1 ]
Peimbert, Manuel [1 ]
机构：
[1] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico
来源：
ASTROPHYSICAL JOURNAL | 2010年 / 724卷 / 01期
关键词：
galaxies: abundances; galaxies: individual (SBS 0335-052); galaxies: ISM; H II regions; ISM: abundances; TELESCOPE ECHELLE SPECTROPHOTOMETRY; PRIMORDIAL HELIUM ABUNDANCE; OPTICAL RECOMBINATION LINES; BLUE COMPACT GALAXIES; CHEMICAL-COMPOSITION; ORION NEBULA; HII-REGIONS; GASEOUS NEBULAE; HEAVY-ELEMENTS; SBS; 0335-052;
D O I：
10.1088/0004-637X/724/1/791
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：791 / 798
页数：8
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