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arXiv 0810.4383astro-ph
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21微米源IRAS 07134+1005的形态运动学特性

Morpho-Kinematic Properties of the 21-Micron Source IRAS 07134+1005

Jun-ichi Nakashima, Nico Koning, Sun Kwok, Yong Zhang

摘要:

本文报道了对21微米源IRAS 07134+1005在CO J=3-2谱线上的亚毫米阵列(SMA)干涉观测结果。为了确定物体分子包络的形态运动学性质,我们使用Shape软件构建了一个模型来模拟观测到的CO图。我们发现,分子气体成分的信封可以被解释为一个几何厚膨胀环面的膨胀速度为8公里/秒。通过拟合形状模型确定的圆环的内半径和外半径分别为1.2”和3.0”。内半径是一致的,与以前的值所确定的辐射转移建模的光谱能量分布和中红外成像的尘埃成分。环的半径和膨胀速度表明,中心恒星大约在1140-1710年前离开了渐近巨星分支,赤道增强质量损失的持续时间大约为2560-3130年。从没有观察到的喷流,我们认为,形成一个双极外流可能缺乏落后的时间从创建赤道环面。

英文摘要:

We report the results of a Submillimeter Array (SMA) interferometric observation of 21-micron source IRAS 07134+1005 in the CO J=3-2 line. In order to determine the morpho-kinematic properties of the molecular envelope of the object, we constructed a model using the Shape software to model the observed CO map. We find that the molecular gas component of the envelopes can be interpreted as a geometrically thick expanding torus with an expanding velocity of 8 km/s. The inner and outer radii of the torus determined by fitting Shape models are 1.2" and 3.0", respectively. The inner radius is consistent with the previous values determined by radiative transfer modeling of the spectral energy distribution and mid-infrared imaging of the dust component. The radii and expansion velocity of the torus suggest that the central star has left the asymptotic giant branch about 1140-1710 years ago, and that the duration of the equatorial enhanced mass loss is about 2560-3130 years. From the absence of an observed jet, we suggest that the formation of a bipolar outflow may lack behind in time from the creation of the equatorial torus.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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