Characterization of the planetary nebula Tc 1 based on VLT X-shooter observations
Characterization of the planetary nebula Tc 1 based on VLT X-shooter observations
复制标题
基于 VLT X 射手观测的行星状星云 Tc 1 特征
DOI：
10.1093/mnras/stz2654
复制
发表时间：
2019
影响因子：
4.8
通讯作者：
Aleman I
中科院分区：
文献类型：
--
作者：
Aleman I
我们提出了一个详细的分析深VLT/X-Shooter观测行星状星云Tc 1。我们计算气体的温度，密度，消光和丰度的几个物种的经验分析的总线通量。此外，对最强谱线的空间分辨分析提供了这些量在整个星云中的分布。新的数据显示，几条谱线呈现出双峰光谱轮廓，与膨胀球壳的蓝移和红移分量一致。通过对这些成分的研究，我们首次构建了一个三维形态学模型，它揭示了Tc 1是一个略微拉长的球体，赤道密度增强，几乎可以在极点看到。一些明亮的线条代表着伸展的翅膀（速度高达几百km s−1），但产生它们的机制尚不清楚。建立了Tc 1主壳层的光电离模型.这些模型预测了中心星星的温度和亮度，以及星云的密度和丰度，与之前的研究类似。我们的模型表明，Tc 1位于大约2千秒差距的距离。我们报告的第一个检测的[Kriii] 6825氪发射线，从中我们确定的氪丰度。我们的模型表明，Tc 1的主壳层是物质束缚的;泄漏的H电离光子可以解释其微弱的AGB残留晕的电离。
We present a detailed analysis of deep VLT/X-Shooter observations of the planetary nebula Tc 1. We calculate gas temperature, density, extinction, and abundances for several species from the empirical analysis of the total line fluxes. In addition, a spatially resolved analysis of the most intense lines provides the distribution of such quantities across the nebula. The new data reveal that several lines exhibit a double peak spectral profile consistent with the blue and redshifted components of an expanding spherical shell. The study of such components allowed us to construct for the first time a three-dimensional morphological model, which reveals that Tc 1 is a slightly elongated spheroid with an equatorial density enhancement seen almost pole on. A few bright lines present extended wings (with velocities up to a few hundred km s−1), but the mechanism producing them is not clear. We constructed photoionization models for the main shell of Tc 1. The models predict the central star temperature and luminosity, as well as the nebular density and abundances similar to previous studies. Our models indicate that Tc 1 is located at a distance of approximately 2 kpc. We report the first detection of the [Kriii] 6825 Å emission line, from which we determine the Krypton abundance. Our model indicates that the main shell of Tc 1 is matter bounded; leaking H ionizing photons may explain the ionization of its faint AGB-remnant halo.