一颗“钻石环”星：一颗年轻（多颗？）对象
A "diamond-ring" star: the unusual morphologic structure of a young (multiple?) object
摘要：
我们观测了IRAS 06468 -0325，通过IJHK和L'滤波器获得光学和红外图像，K波段低分辨率光谱，以及CO和CS的毫米线观测。IRAS 06468 -0325有一个非常不寻常和神秘的形态，有两个组成部分：一个明亮的，接近点状的源（钻石）和一个锋利的边缘环状结构（环）。光源在波长短于I波段的光学中未被检测到。在观察到的所有成像带中都可以看到钻石。IRAS 06468 -0325中的环状结构在I、J、H和Ks中清晰可见。在L '波段图像中未检测到。钻石的红外颜色与过量的拱星发射和年轻恒星的性质相一致。在v_{LSR}为30.5 km s{-1}（对应于3 kpc的运动学距离）处，在IRAS 06468 -0325方向观察到强非高斯和中等亮度的CO（1-0）和{13}CO（2-1）谱线。检测到非常弱的C{18}O（2-1）和CS（2-1）线。钻石和戒指的K波段光谱在连续谱的斜率和支持戒指是钻石反射光的观点的线的存在方面都是相似的。根据目前的数据，有几种不同的情况可以解释这个物体的形态。然而，现有的数据似乎有利于IRAS 06468 -0325的形态对应于一个年轻的恒星多系统在一个短暂的阶段，其中一个二进制共存的circumbinary光盘，类似于GG头的情况。在这种情况下，清晰的环的清晰度可能是由于潮汐截断来自双星或多星系统中组件之间的动态相互作用。IRAS 06468 -0325可能是一个重要的罕见案例，说明了双星或多星形成过程的短暂阶段。
英文摘要：
We have observed IRAS06468-0325 obtaining optical and infrared images through IJHKs and L' filters, K-band low-resolution spectroscopy, together with millimetre line observations of CO and CS. IRAS06468-0325 has a very unusual and enigmatic morphology with two components: a bright, close to point-like source (the diamond) and a sharp-edge ring-like structure (the ring). The source is not detected in the optical, at wavelengths shorter than the I-band. The diamond is seen in all the imaging bands observed. The ring-like structure in IRAS06468-0325 is clearly seen in the I, J, H, and Ks. It is not detected in the L'-band image. Infrared colours of the diamond are compatible with excess circumstellar emission and a young stellar nature. A strongly non-gaussian and moderately bright CO(1-0) and {13}CO(2-1) lines are seen towards IRAS06468-0325, at v_{LSR} of 30.5 km s{-1} (corresponding to a kinematic distance of 3 kpc). Very weak C{18}O(2-1) and CS(2-1) lines were detected. K-band spectra of the diamond and of the ring are similar both in the slope of the continuum and in the presence of lines supporting the idea that the ring is reflected light from the diamond. With the current data, a few different scenarios are possible to explain the morphology of this object. However, the available data seem to favour that the morphology of IRAS06468-0325 correspond to a young stellar multiple system in a transient stage where a binary co-exists with a circumbinary disc, similar to the case of GG Tau. In this case, the sharpness of the well-defined ring may be due to tidal truncation from dynamic interactions between components in a binary or multiple stellar system. IRAS06468-0325 may be an important rare case that illustrates a short-lived stage of the process of binary or multiple star formation.
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