A Reconnaissance of the 900-1200 Å Spectra of Early O Stars in the Magellanic Clouds
A Reconnaissance of the 900-1200 Å Spectra of Early O Stars in the Magellanic Clouds
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麦哲伦星云中早期 O 星 900-1200 埃光谱的勘测
DOI：
10.1086/309768
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
R. Kudritzki
中科院分区：
文献类型：
--
作者：
N. Walborn;K. Long;D. Lennon;R. Kudritzki
介绍了在Astro-2使命期间用霍普金斯紫外望远镜观测到的麦哲伦云中O星远紫外（900-1200欧）光谱的第一次调查。每个星云中有五个天体，包括四个O3型（其中一个是目前已知最大质量星星的候选者）和一对相对CNO强度明显不同的O 4 If超巨星。所有的SMC对象都在其最大的H II区域，NGC 346，并显示出强烈的系统性金属缺乏的影响。系统的光谱类型依赖的众多星风功能在这个相对较少研究的波长范围内，包括那些O VI和S VI，说明和描述。其中一颗EB-V = 0.25的O3星显示出强烈的星际H2特征。
The first survey of the far-UV (900-1200 Å) spectra of O stars in the Magellanic Clouds, observed with the Hopkins Ultraviolet Telescope during the Astro-2 mission, is presented. Five objects in each Cloud were obtained, including four of type O3 (one of which is the current candidate for the most massive star known) and a pair of O4 If supergiants with remarkably different relative CNO strengths. All of the SMC objects are in its largest H II region, NGC 346, and show strong effects of the systemic metal deficiency. The systematic spectral-type dependence of the numerous stellar-wind features in this relatively little-studied wavelength range, including those of O VI and S VI, is illustrated and described. One of the LMC O3 stars, with EB-V = 0.25, displays strong interstellar H2 features.