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arXiv 1107.5409astro-ph.SR
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年轻双星系统Haro 6-10的多波长观测:未对准盘的情况

Multi-wavelength observations of the young binary system Haro 6-10: The case of misaligned discs

V. Roccatagliata, Th. Ratzka, Th. Henning, S. Wolf, Ch. Leinert, J. Bouwman

摘要:

上下文我们对年轻的双星系统Haro 6-10(GV Tau,IRAS 04263+2426)进行了多波长,高分辨率的观测调查,该系统是为数不多的已知红外同伴之一。目标。该项目的主要目标是确定Haro 6-10系统中拱星和拱双星物质的物理和几何性质。方法.分析了不同波段的高分辨率光学(HST/WFPC 2)和近红外(VLT/NACO)图像,以研究双星周围物质的大尺度结构,并进行了中红外干涉测量(VLTI/ESTA)和光谱学(3.6米ESO望远镜的TIMMI 2),以确定单个组件周围星周物质的结构和光学厚度。结果多波长观测表明,双星系统Haro 6-10的两个组成部分都嵌入在一个共同的包络中。测得的消光表明,该包层的尘埃成分与星际介质的成分相似。该系统的每个组成部分都有一个典型的年轻恒星的拱星盘状结构。圆盘高度错位:北部的部分几乎是边缘上的,南部的部分几乎是正面上的圆盘。结论.双星系统的两个主要形成方案是在稠密的环境中引力捕获一个经过的物体,以及坍缩的分子云的碎片。考虑到金牛座-御夫座恒星形成区的低密度环境,第一种情况不太可能发生在哈罗6-10。双星系统最有可能是由坍缩的分子云的两个不同部分碎裂,再加上其他与云和/或原恒星有关的动力学过程而形成的。这也可以解释其他有红外伴星的双星系统。

英文摘要:

Context. We present a multi-wavelength, high-resolution observational survey of the young binary system Haro 6-10 (GV Tau, IRAS 04263+2426), which is harbouring one of the few known infrared companions. Aims. The primary goal of this project is to determine the physical and geometrical properties of the circumstellar and circumbinary material in the Haro 6-10 system. Methods. High-resolution optical (HST/WFPC2) and near-infrared (VLT/NACO) images in different bands were analysed to investigate the large-scale structures of the material around the binary.Mid-infrared interferometry (VLTI/MIDI) and spectroscopy (TIMMI2 at the 3.6m ESO telescope) were carried out to determine the structure and optical depth of the circumstellar material around the individual components. Results. The multi-wavelength observations suggest that both components of the binary system Haro 6-10 are embedded in a common envelope. The measured extinction indicates a dust composition of the envelope similar to that of the interstellar medium. Each component of the system has a circumstellar disc-like structure typical of young stars. The discs are highly misaligned: the northern component is seen almost edge-on and the southern component is an almost face-on disc. Conclusions. The two main formation scenarios of binary systems with misaligned discs are the gravitational capture of a passing object in a dense environment, and the fragmentation of the collapsing molecular cloud. Given the low-density environment of the Taurus-Aurigae star-forming region, the first scenario is unlikely for Haro 6-10. The binary system most probably formed via fragmentation of two different parts of the collapsing molecular cloud combined with other dynamical processes related to the cloud and/or the protostars. This can be the explanation also for other binary systems with an infrared companion.

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