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arXiv 2101.02191astro-ph.GAastro-ph.SR
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通过深高光谱分辨率光谱学研究猎户座星云中的光电离赫比格-哈罗天体I:HH529II和III

Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy I: HH529II and III

J. E. Méndez-Delgado, C. Esteban, J. García-Rojas, W. J. Henney, A. Mesa-Delgado, K. Z. Arellano-Córdova

摘要:

我们提出的物理条件,化学成分和运动学特性的分析两个弓形激波-HH 529 II和HH 529 III-的完全光电离赫比格-哈罗对象HH 529在猎户座星云。这些数据是由8.2米甚大望远镜的紫外和视觉中阶梯光谱仪和哈勃太空望远镜20年的成像获得的。我们将HH 529 II和III的高速分量的发射与星云分量的发射分开,通过多种诊断,包括一些基于重组线(RL)的诊断,确定所有分量中的$n_{\rm e}$和$T_{\rm e}$。我们推导出离子丰度的几种离子,碰撞激发线(CEL)和RL的基础上。我们发现温度涨落范式($t^2$)和丰度差异因子(ADF)在猎户座星云的主发射的预测之间有很好的一致性。然而,$t^2$不能解释HH 529 II和III中较高的ADF。我们估计猎户座星云的气相中有6%的铁,而这个值在HH 529 II中增加到14%,在HH 529 III中增加到10%到25%。我们发现这种增加可能是由于弓形激波中尘埃颗粒的破坏。我们发现在HH 529 II-III中C,O,Ne,S,Cl和Ar的丰度约为0.1 dex,这可能与HH 529流源中包含缺H物质有关。我们确定自行HH 529找到多个离散的功能。我们估计了HH 529相对于$58\pm 4^{\circ}$天空平面的气流角。

英文摘要:

We present the analysis of physical conditions, chemical composition and kinematic properties of two bow shocks -HH529 II and HH529 III- of the fully photoionized Herbig-Haro object HH 529 in the Orion Nebula. The data were obtained with the Ultraviolet and Visual Echelle Spectrograph at the 8.2m Very Large Telescope and 20 years of Hubble Space Telescope imaging. We separate the emission of the high-velocity components of HH529 II and III from the nebular one, determining $n_{\rm e}$ and $T_{\rm e}$ in all components through multiple diagnostics, including some based on recombination lines (RLs). We derive ionic abundances of several ions, based on collisionally excited lines (CELs) and RLs. We find a good agreement between the predictions of the temperature fluctuation paradigm ($t^2$) and the abundance discrepancy factor (ADF) in the main emission of the Orion Nebula. However, $t^2$ can not account for the higher ADF found in HH 529 II and III. We estimate a 6% of Fe in the gas-phase of the Orion Nebula, while this value increases to 14% in HH 529 II and between 10% and 25% in HH 529 III. We find that such increase is probably due to the destruction of dust grains in the bow shocks. We find an overabundance of C, O, Ne, S, Cl and Ar of about 0.1 dex in HH 529 II-III that might be related to the inclusion of H-deficient material from the source of the HH 529 flow. We determine the proper motions of HH 529 finding multiple discrete features. We estimate a flow angle with respect to the sky plane of $58\pm 4^{\circ}$ for HH 529.

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