BIPOLAR JETS PRODUCED BY A SPECTROSCOPIC BINARY
BIPOLAR JETS PRODUCED BY A SPECTROSCOPIC BINARY
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由光谱双星产生的双极射流
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Winn
中科院分区：
文献类型：
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作者：
R. Mundt;C. Hamilton;W. Herbst;C. Johns–Krull;J. Winn
我们提出的证据表明，光谱鉴定的前主序双星 KH 15D（P = 48.4 d，ϵ∼ 0.6，近星子间隔 ∼18 RA，MA = 0.6 M☉，MB = 0.7 M☉）的双极喷流是整个双星系统的共同产物，而不是从任意一颗恒星单独发射的。它们可能是从环双星盘（CBD）的最里面部分发射出来的，也可能是由单个恒星驱动的两个流出物合并而成的。这一证据基于在这个几乎边缘系统的食相期间获得的高分辨率 Hα 和 [O i]λ6300 线剖面。星盘掩星 A 星（目前唯一可见的恒星）强烈抑制了恒星 Hα 和连续发射，使人们能够研究双极喷流的微弱红移和蓝移发射成分。整个双星系统喷流产生的最有力证据来自于观察到的两个喷流分量相对于双星系统速度的径向速度对称性，以及当前从 CBD 到双星系统的吸积模型。
We present evidence that the spectroscopically identified bipolar jets of the pre-main sequence binary KH 15D (P = 48.4 d, ϵ∼ 0.6, periastron separation ∼18 RA, MA = 0.6 M☉, MB = 0.7 M☉) are a common product of the whole binary system, rather than being launched from either star individually. They may be launched from the innermost part of the circumbinary disk (CBD) or may result from the merging of two outflows driven by the individual stars. This evidence is based on high-resolution Hα and [O i]λ6300 line profiles obtained during eclipse phases of this nearly edge-on system. The occultation of star A (the only currently visible star) by the disk strongly suppresses the stellar Hα and continuum emission and allows one to study the faint redshifted and blueshifted emission components of the bipolar jets. The strongest evidence for jet production by the whole binary system comes from the observed radial velocity symmetry of the two jet components relative to the systemic velocity of the binary in combination with current accretion models from the CBD onto a binary system.