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arXiv 1012.3268astro-ph.SR
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IRAS 05553+1631中流出物的倾斜角：一种校正投影效应的方法

Inclination-angle of the outflow in IRAS 05553+1631: A method to correct the projection effect

Shuo Kong, Yuefang Wu

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Accepted by the Monthly Notices of the Royal Astronomical Society
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摘要：

利用KOSMA 3米望远镜观测到的12 CO J=3-2和13 CO J=2-1谱线对IRAS 05553+1631进行了测绘研究。尺寸为0.65 pc且LTE质量为120 M \odot的芯由13 CO J=2-1线的映射定义。我们确定了双极流出，12 CO J=3-2。为了准确计算出流参数，克服投影效应是很重要的。提出了一种直接计算倾角θ的新方法。利用出流等值线图建立了两个基本方程，最后得到了“角度函数”和“角度方程”，从而导出了θ。我们将我们的方法应用于IRAS 05553+1631的外流，发现θblue是73 \circ，θred是78 \circ。与最初在假设45 ° \circ倾角下估计的参数相比，新推导的参数随不同因素而变化。例如，蓝色和红色波瓣的时间尺度分别减少了0.31和0.21。较大的影响适用于机械光度，驱动力和质量损失率。修正前后参数的比较表明，倾角的影响不可忽略。

英文摘要：

A mapping study of IRAS 05553+1631 was performed with 12CO J=3-2 and 13CO J=2-1 lines observed by the KOSMA 3 m-telescope. A core with a size of 0.65 pc and with a LTE mass of 120 M\odot was defined by the mapping with 13CO J=2-1 line. We have identified a bipolar outflow with 12CO J=3-2. For accuracy in the calculation of outflow parameters, overcoming the projection effect is important. We propose a new method to directly calculate the inclination-angle θ. We establish two basic equations with the help of outflow contour diagram and finally obtain the "angle function" and the "angle equation" to derive θ. We apply our method to the outflow of IRAS 05553+1631, finding that θblue is 73\circ and θred is 78\circ. Compared to the parameters initially estimated under an assumption of 45\circ inclination-angle, the newly derived parameters are changed with different factors. For instance, the timescales for the blue and the red lobes are reduced by 0.31 and 0.21, respectively. Larger influences apply to mechanical luminosity, driving force, and mass-loss rate. The comparisons between parameters before and after the correction show that the effect of the inclination-angle cannot be neglected.

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