标题： BIMA CO观测半规则脉动星EP Aqr，其具有双组分线轮廓 显示英文标题

标题： BIMA CO Observation of EP Aqr the Semiregular Pulsating Star with a Double Component Line Profile

摘要： 本文报告了伯克利-伊利诺伊-马里兰阵列干涉观测EP Aqr的结果，EP Aqr是一颗半规则脉动星，在CO J=1-0线中具有双成分线轮廓。 宽成分显示出平顶轮廓，窄成分显示出尖锐的强峰。 尽管先前的单碟观测表明CO J=2-1线呈现出高斯状轮廓，但CO J=1-0线却没有。 窄和宽成分的空间分布似乎都大致呈圆形且具有相同的峰值位置。 未观察到显著的速度梯度。 EP Aqr分子包层的空间运动特性让人联想到多重壳结构模型，而非双极流和盘模型。 这种解释的一个问题是未发现窄成分区域与宽成分区域之间相互作用的证据。 在CO J=2-1线中看到的高斯状特征可能对理解EP Aqr分子包层的空间运动特性起关键作用。 显示英文摘要

摘要： This paper reports the results of a Berkeley-Illinois-Maryland array interferometric observation of EP Aqr, a semiregular pulsating star with a double component line profile in the CO J=1-0 line. The broad component shows a flat-top profile, and the narrow component shows a spiky strong peak. Though the previous single dish observations suggested that the CO J=2-1 line exhibits a Gaussian-like profile, the CO J=1-0 line does not. The spatial distributions of both the narrow and broad components appears to be roughly round with the same peak positions. No significant velocity gradient is seen. The spatial-kinetic properties of the molecular envelope of EP Aqr are reminiscent of a multiple shell structure model rather than a bipolar flow and disk model. A problem of this interpretation is that no evidence of interaction between the narrow and broad component regions is seen. A Gaussian-like feature seen in the CO J=2-1 line might play a key role to understand the spatio-kinetic properties of the molecular envelope of EP Aqr.