Rotational and Orbital Angular Momentum Evolution: From Self-Embedded Protostars to T-Tauri Stars

旋转和轨道角动量演化：从自嵌入原恒星到 T-Tauri 恒星

• 批准号: 0206146
• 负责人: Mary Barsony
• 金额: --
• 依托单位: SPACE SCIENCE INSTITUTE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-15 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206146&HistoricalAwards=false
• 关键词: Rotational; Orbital; Angular; Momentum; Evolution

AST 0206146PI: Mary BarsonyAn understanding of the processes by which stars and planets form remains one of the fundamental goals of astronomy and astrophysics. Although the broad outline of the process has become clear, much remains unexplained, particularly concerning rotational and orbital angular momentum evolution during the pre-main-sequence lifetime of young stellar objects. How and why do multiple systems form from a single infall envelope? What physical mechanisms regulate the rotation rates of young stellar objects? How do rotational velocities evolve with pre-main-sequence evolutionary state? The PI will carry out two major projects to address these questions: 1) a dedicated, comprehensive program for the determination of protostellar rotational periods via near-infrared photometric monitoring to obtain lightcurves, and 2) a systematic near-and mid-infrared, high angular resolution survey of embedded young stellar objects in a single star-forming cloud to discover and characterize the evolution of binary/multiple systems over timescales of 100,000 to 1 million years. ***

AST 0206146 PI：玛丽巴松了解恒星和行星形成的过程仍然是天文学和天体物理学的基本目标之一。 虽然这一过程的大致轮廓已经变得清晰，但仍有许多问题无法解释，特别是关于年轻恒星在主序前寿命期间的旋转和轨道角动量演化。如何以及为什么多个系统从一个单一的下降信封形成？ 是什么物理机制控制着年轻恒星的自转速率？ 旋转速度如何随主序前演化状态演化？ PI将开展两个主要项目来解决这些问题：1）一个专门的，全面的计划，通过近红外光度监测来确定原恒星的旋转周期，以获得光变曲线，和2）一个系统的近和中红外，对单个恒星形成云中嵌入的年轻恒星天体进行高角分辨率巡天，以发现和表征双星的演化，在十万年到一百万年的时间尺度上形成多个系统。***