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

页码：791 / 798

页数：8

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