Zinc abundances of planetary nebulae
Zinc abundances of planetary nebulae
复制标题
行星状星云的锌丰度
DOI：
10.1093/mnras/stu696
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发表时间：
2014
影响因子：
4.8
通讯作者：
H. Dinerstein
中科院分区：
文献类型：
--
作者：
Christina L. Smith;A. Zijlstra;H. Dinerstein
锌是用于测量Fe/H的有用替代元素，因为与铁不同，锌在气相介质中不会耗尽。利用3.625 μ m处的[Zn IV]发射线，对9个银河系行星状星云的样品进行了Zn/H和O/Zn比值的计算，其中7个是基于VLT的新观测结果。基于光电离模型，O/O++是锌最可靠的电离校正因子，可以很容易地从光发射谱线确定，估计准确度为10%或更好的所有目标在我们的样品。发现大部分样品在[Zn/H]中是亚太阳能的。[O/Zn]在一半的样品中被发现是一致的太阳能在不确定性，而其余一半是增强[O/Zn]。[Zn[O/H]和[O/Zn]作为银心距的函数已经被研究过了，并且几乎没有证据支持在任何一种情况下的趋势。
Zinc is a useful surrogate element for measuring Fe/H as, unlike iron, it is not depleted in the gas phase media. Zn/H and O/Zn ratios have been derived using the [Zn IV] emission line at 3.625um for a sample of nine Galactic planetary nebulae, seven of which are based upon new observations using the VLT. Based on photoionization models, O/O++ is the most reliable ionisation correction factor for zinc that can readily be determined from optical emission lines, with an estimated accuracy of 10% or better for all targets in our sample. The majority of the sample is found to be sub-solar in [Zn/H]. [O/Zn] in half of the sample is found to be consistent with Solar within uncertainties, whereas the remaining half are enhanced in [O/Zn]. [Zn/H] and [O/Zn] as functions of Galactocentric distance have been investigated and there is little evidence to support a trend in either case.