Abundances in Galactic bulge planetary nebulae from optical, ultraviolet and infrared observations

Abundances in Galactic bulge planetary nebulae from optical, ultraviolet and infrared observations
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通过光学、紫外线和红外线观测发现银河核球行星状星云的丰度

DOI:
10.1093/mnras/stx1720
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发表时间:
2017
影响因子:
4.8
通讯作者:
Dinerstein, Harriet L.
Dinerstein, Harriet L.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Smith, Christina L.;Zijlstra, Albert A.;Gesicki, Krzysztof M.;Dinerstein, Harriet L.

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铁在行星状星云的高电离环境中会遭受高水平的损耗,这使得直接测定未耗尽的元素铁丰度变得困难。锌不会遭受与铁相同的贫化效应,可以用作替代元素来测量铁丰度,因为在宽范围的金属丰度中存在近似恒定的锌与铁的比率。在本文中,我们报告锌丰度的六个银河系球状行星状星云确定的新的观测与红外光谱仪和阵列相机(ISAAC)的甚大望远镜,智利,仪器的退役之前,以及另外三个基于文献观测。本文介绍了行星状星云样品的紫外线和目视中阶梯光谱仪(UVES)数据,这些数据已被用来计算各种元素和离子的丰度、温度和密度。从UVES数据得到的丰度与文献结果吻合得很好。[Zn[O/H]一般是太阳下的,[O/Zn]相对于太阳是一致的或富集的。
Iron suffers from high levels of depletion in the highly ionized environments of planetary nebulae, making the direct determination of undepleted elemental iron abundances difficult. Zinc, which does not suffer from the same depletion effects as iron, may be used as a surrogate element to measure iron abundances as there is an approximately constant zinc-to-iron ratio across a wide range of metallicities. In this paper, we report zinc abundances of six Galactic bulge planetary nebulae determined from new observations taken with Infrared Spectrometer And Array Camera (ISAAC) on the Very Large Telescope, Chile, prior to the instrument's decommissioning as well as a further three based upon literature observations. Ultraviolet and Visual Echelle Spectrograph (UVES) data of the sample planetary nebulae are presented and have been used to derive abundances, temperatures and densities of a variety of elements and ions. The abundances derived from the UVES data agree well with results from the literature. [Zn/H], determined from the ISAAC observations, is found to be generally subsolar and [O/Zn] is found to be either consistent or enriched with respect to solar.
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