Abstract

We propose an explanation for the rapid color changes on the color–magnitude diagrams observed by Gahm et al. in the T Tauri star RY Lup during its deep minima. Our calculations have shown that the hot accretion spot on the stellar surface in combination with the inhomogeneous structure of the gas–dust clouds obscuring the star can be responsible for these changes. The observed rate of of the color changes allows one to estimate the velocity of the screen across the stellar disk \({\approx}100\) km s\({}^{-1}\). This velocity is close to the typical gas velocities near T Tauri stars.

中文翻译：

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论 UX Ori Star RY Lupi 在深极小值处快速颜色变化的本质

摘要

我们对 Gahm 等人观察到的颜色幅度图上的快速颜色变化提出了解释。在金牛座 T 星 RY Lup 的极小值期间。我们的计算表明，恒星表面的热吸积点与遮蔽恒星的气尘云的不均匀结构相结合，可能是造成这些变化的原因。观察到的颜色变化率可以估计屏幕穿过恒星盘的速度\({\approx}100\) km s \({}^{-1}\)。该速度接近金牛座 T 星附近的典型气体速度。