Young Stars and Strong Stellar Activity

今天在恒星演化领域最令人兴奋的话题之一是新恒星和行星系统的形成。我们有令人信服的观测证据表明，这些事件发生在星际气体和尘埃云中，这些气体和尘埃已经被充分压缩(通过一个仍然鲜为人知的过程)，以至于重力在局部和在100秒的地方将气体和尘埃聚集在一起。当物质坍塌时，其剩余角动量使其旋转得更快，导致中心凝聚和周围的圆盘。来自圆盘的物质继续被中心凝聚吸积，并演化成T-Tauri星。周围剩下的圆盘可能会形成行星。首席研究员(PI)建议继续对这些年轻恒星天体进行光学和红外观测以及理论研究，这项工作以前是由NSF资助的。特别是，他将专注于金牛座T星，它们的变异性，以及其中许多恒星周围的盘状物。他还将研究与冷恒星活动周期相关的磁场。

One of the most exciting topics today in the area of stellar evolution is the formation of new stars and of planetary systems. We have convincing observational evidence that these events take place in interstellar clouds of gas and dust that have been compressed sufficiently (by a still poorly understood process) for gravity to pull together locally and at 100s of places the gas and dust. As the matter collapses, its residual angular momentum causes it to rotate more rapidly, resulting in a central condensation and a surrounding disk. Matter from the disk continues to be accreted by the central condensation, which evolves into a T Tauri star. The surrounding disk that remains may give rise to planets. The Principal Investigator (PI) proposes to continue with the optical and infrared observations and the theoretical research of these young stellar objects, which was previously funded by NSF. In particular, he will focus on T Tauri stars, their variability, and the disks that surround many of them. He will also study the magnetic fields associated with the activity cycles of cool stars.