Stellar and Circumstellar Properties of the Pre-Main-Sequence Binary GV Tau from Infrared Spectroscopy
Stellar and Circumstellar Properties of the Pre-Main-Sequence Binary GV Tau from Infrared Spectroscopy
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红外光谱中前主序二元 GV Tau 的恒星和周星特性
DOI：
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发表时间：
2008
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通讯作者：
J. Carr
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作者：
G. Doppmann;J. Najita;J. Carr
我们报告的空间分辨光谱的两个组成部分的低质量前主序列二进制GV头。K和L波段的高分辨率光谱被用来表征双星的恒星性质，并探索星周环境的性质。我们发现，南部的分量，GV Tau S，是一个径向速度变量，可能是由于一个看不见的低质量的同伴。Gibb和同事先前报道的强的温暖的气态HCN吸收在我们的观测期间并不存在。相反，我们检测到温暖（~500 K）的分子吸收与类似的属性对北方红外伴星，GV Tau N。在我们观测的时期，朝向GV Tau N的吸收气体的径向速度大约是GV Tau分子包层的径向速度，但它相对于星星的红移约为13 km s−1。我们的研究结果的一个解释是，GV Tau N也是一个二进制和大多数的温暖分子吸收出现在一个circumbinary盘看起来接近边缘。
We report spatially resolved spectroscopy of both components of the low-mass pre-main-sequence binary GV Tau. High-resolution spectroscopy in the K and L bands is used to characterize the stellar properties of the binary and to explore the nature of the circumstellar environment. We find that the southern component, GV Tau S, is a radial velocity variable, possibly as a result of an unseen low-mass companion. The strong warm gaseous HCN absorption reported previously by Gibb and coworkers toward GV Tau S was not present during the epoch of our observations. Instead, we detect warm (~500 K) molecular absorption with similar properties toward the northern infrared companion, GV Tau N. At the epoch of our observations, the absorbing gas toward GV Tau N was approximately at the radial velocity of the GV Tau molecular envelope, but it was redshifted with respect to the star by ~13 km s−1. One interpretation of our results is that GV Tau N is also a binary and that most of the warm molecular absorption arises in a circumbinary disk viewed close to edge-on.