TOWARD UNDERSTANDING THE ENVIRONMENT OF R MONOCEROTIS FROM HIGH-RESOLUTION NEAR-INFRARED POLARIMETRIC OBSERVATIONS
TOWARD UNDERSTANDING THE ENVIRONMENT OF R MONOCEROTIS FROM HIGH-RESOLUTION NEAR-INFRARED POLARIMETRIC OBSERVATIONS
复制标题
从高分辨率近红外偏振观测了解麒麟座的环境
DOI：
10.1088/0004-637x/721/2/1748
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
P. Voyer
中科院分区：
文献类型：
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作者：
M. Jolin;P. Bastien;F. Denni;D. Lafreniére;R. Doyon;P. Voyer
介绍了在加拿大-法国-夏威夷望远镜上获得的R Mon高分辨率h波段成像偏振观测结果。这些数据显示了一个中心对称的模式，其强度轮廓延长，主要是由于伴星R星b的存在。我们还考虑了已发表的R波段数据，它显示了一个扩展的直角锥形反射星云，在光学峰中有偏移。本文用辐射传输蒙特卡罗程序研究了月球的星周环境。所得到的最佳拟合模型成功地再现了两个波段数据中的特征。该模型表明存在相对较小的天文硅酸盐颗粒，范围为0.04 μm ~ 0.15 μm，分布在小圆盘、内包膜和外包膜三种结构中。该腔体由一个具有恒定低密度的锥形结构建模，我们包括一个“喉道”来产生光峰的偏移。我们的模型预测R和H波段之间的极化反转为90°。观测表明，随着时间的推移，在近红外波段，平行、垂直和其他角度的位置角都可能出现。
High-resolution H-band imaging polarimetric observations of R Mon obtained at the Canada–France–Hawaii telescope are presented. These data show a centrosymmetric pattern with elongated intensity contours mostly due to the presence of the companion R Mon B. We also consider published R-band data, which show an extended right-angle conical reflection nebula with an offset in the optical peak. We study the circumstellar environment of R Mon with a radiative transfer Monte Carlo code. The best-fitting model obtained succeeds in reproducing the characteristics seen in the data in the two bands simultaneously. The model indicates the presence of relatively small astronomical silicate grains ranging from 0.04 μm to 0.15 μm distributed into three structures: a small disk, an inner envelope, and an outer envelope. The cavity is modeled by a conical structure with a constant low density and we include a “throat” to produce the offset of the optical peak. Our model predicts a polarization reversal by 90° between the R and H bands. Observations show that position angles parallel, perpendicular, and also at other angles to the disk can occur over time in the near-infrared.