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Are Both Stars in a Classic T Tauri Binary Classic T Tauri Stars?

机译:两颗星都在经典T Tauri双星经典T Tauri星中吗?

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Large near-IR color excesses and emission-line spectra indicate the presence of optically thick circumstellar accretion disks and active boundary layers in young stars. We investigate whether this classic T Tauri (TT) behavior is found in one or both members of a binary system previously identified as a TT on the basis of the unresolved light. We consider the angularly resolved Brγ and, in one case, Na I, spectra of four close (13-26) TT systems. We also take into account the angularly resolved near-IR (K-L) colors of eight additional young binaries with separations between 03 and 25. We find that for all 12 systems, both components show, or have shown in the history of their observation, evidence for TT behavior. We demonstrate that this cannot be the result of random pairing of a population of single TT and weak-lined T Tauri (WT) stars. We speculate that the result that inner, AU-sized disks tend to survive for a similar length of time in both components of a close (03-26) binary suggests that a circumbinary envelope effectively regulates the common evolution of the inner disks.
机译:较大的近红外色差和发射线光谱表明,年轻恒星中存在光学上较厚的星际吸积盘和活动边界层。我们调查这种经典的T Tauri(TT)行为是否在未解析的光的基础上先前被标识为TT的二元系统的一个或两个成员中找到。我们考虑了四个近距离(13-26)TT系统的角度分解的Brγ以及一种情况下的Na I的光谱。我们还考虑了八种其他新的二进制二进制文件(在03到25之间的间隔)的角度分辨近红外(KL)颜色。我们发现,对于所有12个系统,这两个分量都显示或已经在其观测历史中显示出证据。用于TT行为。我们证明这不是单个TT和弱衬T Tauri(WT)星群随机配对的结果。我们推测内部AU大小的磁盘倾向于在封闭(03-26)二进制文件的两个分量中生存相似的时间长度的结果表明,外接包膜有效地调节了内部磁盘的共同演化。

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