Vertical distribution of chromium in the atmospheres of HgMn stars
Vertical distribution of chromium in the atmospheres of HgMn stars
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HgMn 星大气中铬的垂直分布
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
S. Hubrig
中科院分区：
文献类型：
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作者：
I. Savanov;S. Hubrig
我们在H翼上使用30个多重Crii谱线来验证10颗HgMn恒星样本大气上层Cr浓度异常的假设。这些线距离H线中心的距离不同，因此在恒星大气的不同深度形成。除了HD 49606外，所有HgMn恒星的Cr丰度都随着恒星大气高度的增加而增加。Cr的垂直分布类似，但不那么明显，以前在Am恒星中发现过。正常晚b型星hd196426和弱磁晚b型星hd168733的Cr丰度没有随深度变化。在HgMn恒星中，垂直分层参数a可能取决于Te，在较热的恒星中发现了最强的垂直梯度。在a和平均恒星丰度对数（Cr/H）之间没有发现相关性。
We use multiplet 30 Crii lines in the wings of H to test the hypothesis of an anomalous concentration of Cr in the upper layers of the atmospheres of a sample of 10 HgMn stars. These lines are at dierent distances from the H line center and are therefore formed at dierent depths in the stellar atmosphere. Except for HD 49606, all HgMn stars show an increase in Cr abundance with height in the stellar atmosphere. A similar vertical distribution of Cr, but less pronounced, has been previously found in Am stars. In contrast, no variation of Cr abundance with the depth has been found for the normal late B-type star HD 196426 and the weak magnetic late B-type star HD 168733. It is possible that in HgMn stars the vertical stratification parameter, a, depends on Te, with the strongest vertical gradient being found in the hotter stars. No correlation was found between a and the average stellar abundance log"(Cr/H).