蛇夫座Rho蛇夫座
The Peculiar Periodic YSO WL 4 in Rho Ophiuchus
摘要：
我们提出了130.87天周期的近红外流量变化的II类金牛座T星WL 4（= 2 MASS J16271848-2429059，ISO-Oph 128）的发现。我们的数据来自2 MASS校准点源工作数据库，并构成了1580个观测的J，H和Ks的一个领域在蛇夫座用于校准2 MASS全天巡天。我们确定了WL 4的光变曲线，其食振幅约为0.4等，持续时间超过四分之一，J-H和H-Ks的颜色变化约为0.1等。我们认为WL 4是一个三重YSO系统，内双星周期为130.87天。我们断定，我们观测到的是内双星的每一个组成部分，在我们的视线方向上，都被环双星盘交替地遮住。该系统将有助于研究地球带YSO盘的性质和动力学在~1百万年。
英文摘要：
We present the discovery of 130.87 day periodic near-infrared flux variability for the Class II T Tauri star WL 4 (= 2MASS J16271848-2429059, ISO-Oph 128). Our data are from the 2MASS Calibration Point Source Working Database, and constitute 1580 observations in J, H and Ks of a field in Rho Ophiuchus used to calibrate the 2MASS All-Sky Survey. We identify a light curve for WL 4 with eclipse amplitudes of ~0.4 mag lasting more than one-quarter the period, and color variations in J-H and H-Ks of ~0.1 mag. The long period cannot be explained by stellar rotation. We propose that WL 4 is a triple YSO system, with an inner binary orbital period of 130.87 days. We posulate that we are observing each component of the inner binary alternately being eclipsed by a circum-binary disk with respect to our line of sight. This system will be useful in investigating terrestrial zone YSO disk properties and dynamics at ~1 Myr.
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