SiO Maser Survey of Cold IRAS Sources
SiO Maser Survey of Cold IRAS Sources
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DOI：
10.1093/pasj/55.1.229
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发表时间：
2003-01
影响因子：
2.3
通讯作者：
J. Nakashima;S. Deguchi
中科院分区：
文献类型：
--
作者：
J. Nakashima;S. Deguchi
本文给出了银河系盘区10 < l < 100，jbj < 5，SiOJ = 1{0，v = 1和2}脉泽谱线的IRAS冷源观测结果。在143个观测源中，有51个探测到SiO脉泽，其中45个是新探测到的SiO脉泽。选定的红外天文卫星源是尘埃温度在160和280 K之间的物体。根据2 MASS近红外图像的确认，大部分样品是AGB或post-AGB星，尽管部分样品涉及恒星形成区（或尘埃Hii区）的致密核心。在新发现的恒星中，有两颗是后AGB恒星的候选者：IRAS 18450 0148（W 43 A）和19312+1950。我们发现，SiO J = 1{0，v = 2的强度比的v = 1线的对象明确地与这些IRAS颜色相关。SiO脉泽的探测率倾向于向银河系中心增加，以及以前的典型AGB星的SiO脉泽调查的情况。本样品的径向速度色散与典型AGB星的SiO脉泽样品的色散相当。这些事实表明，目前带有SiO脉泽的冷IRAS源样本具有与典型AGB星非常相似的运动学性质。
We present the results of observations of cold IRAS sources in the Galactic disk area, 10 < l < 100 and jbj < 5 , in the SiO J = 1{0, v = 1 and 2 maser lines. SiO masers were detected in 51 out of 143 observed sources; 45 were new detections in SiO masers. The selected IRAS sources were objects with dust temperatures of between 160 and 280 K. According to a conrmation using 2MASS near-infrared images, a majority of the sample are AGB or post-AGB stars, although dense cores in the starforming regions (or dusty Hii regions) are involved in part of the sample. Among new detections, two were candidates for post-AGB stars: IRAS 18450 0148 (W 43A), and 19312+1950. We found that the intensity ratios of the SiO J = 1{0, v = 2 to the v = 1 line of the objects clearly correlate with those IRAS colors. The detection rates of SiO masers tend to increase toward the Galactic center as well as the cases of previous SiO maser surveys of typical AGB stars. No strong associations of the objects to the spiral arms were found. The radial-velocity dispersion of the present sample is comparable with the dispersion of the SiO maser sample of typical AGB stars. These facts suggest that the present sample of cold IRAS sources with SiO masers has a kinematic property very similar with that of typical AGB stars.