An empirical calibration of sulphur abundance in ionised gaseous nebulae
An empirical calibration of sulphur abundance in ionised gaseous nebulae
复制标题
电离气态星云中硫丰度的经验校准
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Jose M. VilchezCarolina Kehrig
中科院分区：
文献类型：
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作者：
E. Pérez;Á. D́ıaz;Jose M. VilchezCarolina Kehrig
我们用[SiI]和[SiI]的亮硫线定义了作为S23参数的S/H丰度的经验刻度。与广泛使用的O23参数的情况相反，直到在盘HII区域中观察到的丰度值为止，校准都保持单值。校准是基于一个大的星云样本，对于这些星云，可以直接确定电子温度，并且可以直接得出硫的化学丰度。从[SIV]10.52微米发射线(国际标准化组织的观测值)得出的ICF，在α=2.5时可以用巴克公式很好地再现。样本中只有大约30%的对象需要大于1.2的ICF。所提出的定标方法的使用为利用S/H作为金属丰度示踪剂的红至红外光谱数据进行丰度分析提供了可能。
We have derived an empirical calibration of the abundance of S/H as a function of the S23 parameter, defined using the bright sulphur lines of [SII] and [SIII]. Contrary to the case for the widely used O23 parameter, the calibration remains single valued up to the abundance values observed in the disk HII regions. The calibration is based on a large sample of nebulae for which direct determinations of electron temperatures exist and the sulphur chemical abundances can be directly derived. ICFs, as derived from the [SIV] 10.52 µ emission line (ISO observations), are shown to be well reproduced by Barker’s formula for a value of α = 2.5. Only about 30% of the objects in the sample require ICFs larger than 1.2. The use of the proposed calibration opens the possibility of performing abundance analysis with red to IR spectroscopic data using S/H as a metallicity tracer.