Spectroscopy of low-metallicity giant H II regions: a grid of low-metallicity stellar atmospheres

被引：2

作者：

Pistinner, SL

Hauschildt, PH

Eichler, D

Baron, EA

机构：

[1] Israel Inst Biol Res, Dept Appl Math, IL-74100 Ness Ziona, Israel

[2] Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA

[3] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel

[4] Univ Oklahoma, Dept Phys & Astron, Norman, OK 73019 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1999年 / 302卷 / 04期

关键词：

stars : atmospheres; H II regions; galaxies : abundances; galaxies : irregular;

D O I：

10.1046/j.1365-8711.1999.02152.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate a grid of spherically symmetric OB stellar atmospheres at low metallicities, including both non-local thermodynamic equilibrium (NLTE) and metal line blanketing effects. This is done to assess the uncertainties in helium abundance determination by nebular codes due to input stellar atmosphere models. The more sophisticated stellar atmosphere models we use can differ from LTE models by as much as 40 per cent in the ratio of He to H ionizing photons.

引用

页码：684 / 692

页数：9

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