HST/STIS observations of the RW Aurigae bipolar jet: mapping the physical parameters close to the source
HST/STIS observations of the RW Aurigae bipolar jet: mapping the physical parameters close to the source
复制标题
RW Aurigae 双极喷流的 HST/STIS 观测：绘制靠近源头的物理参数
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
T. Ray
中科院分区：
文献类型：
--
作者：
S. Melnikov;J. Eisloffel;F. Bacciotti;J. Woitas;T. Ray
我们提出了新的光谱诊断调查的结果，适用于高分辨率的长缝光谱的RW Aur双极射流获得HST/STIS。光谱包括禁戒双峰[O I] 6300，6363\AA，[S II] 6716，6731\AA，和[N II] 6548，6583 \AA，我们用来确定电子密度，电子温度，氢电离分数，总氢密度，径向速度和质量流出率。我们能够在红色光束中提取3”.9的参数，在蓝移光束中提取2”.1的参数。RW Aur喷流似乎是迄今为止研究的金牛座T星星的第二个致密流出物，但它的其他性质与年轻恒星的其他喷流非常相似。沿着头几个角秒的RW Aur喷流的物理参数的总体趋势沿着是类似的HH 30和DG Tau，这可以反映在该地区的机制中的类比，这表明相同的发动机是加速喷流在金牛座T星流出。我们的研究的RW Aur喷流表明，第一次，尽管检测到显着的不对称的物理和运动学性质之间的两个瓣，在两个瓣的质量流出率是相似的。这似乎表明，中央引擎在系统的两侧都具有约束对称性，并且观察到的不对称性可能是由于不同的环境条件。
We present the results of new spectral diagnostic investigations applied to high-resolution long-slit spectra of the RW Aur bipolar jet obtained with HST/STIS. The spectra include the forbidden doublets [O I] 6300,6363 \AA, [S II] 6716,6731 \AA, and [N II] 6548, 6583 \AA that we utilized to determine electron density, electron temperature, hydrogen ionisation fraction, total hydrogen density, radial velocity and the mass outflow rate. We were able to extract the parameters as far as 3".9 in the red- and 2".1 in the blueshifted beam. The RW Aur jet appears to be the second densest outflow from a T Tauri star studied so far, but its other properties are quite similar to those found in other jets from young stars. The overall trend of the physical parameters along the first few arcseconds of the RW Aur jet is similar to that of HH 30 and DG Tau and this can reflect analogies in the mechanisms operating in that region, suggesting the same engine is accelerating the jets in the T Tauri stars with outflows. Our study of the RW Aur jet indicates for the first time that, despite the detected marked asymmetries in physical and kinematic properties between the two lobes, the mass outflow rates in the two lobes are similar. This appears to indicate that the central engine has constraining symmetries on both sides of the system, and that the observed asymmetries are probably due to different environmental conditions.