Time Resolved Studies of Outflows from Massive Sta

大规模统计数据流出的时间分辨研究

• 批准号: 1615343
• 负责人: Veronique Petit
• 金额: $ 41.74万
• 依托单位: Florida Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-15 至 2017-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1615343&HistoricalAwards=false
• 关键词: Time; Resolved; Studies; Outflows; Massive

This team will use telescopes in Arizona and Chile to collect data on massive stars expelling gas and dust. Such material is eventually recycled in new star and planet forming regions. The researchers will measure stellar wind variability in two groups of stars: those with magnetic fields and those in binary systems. They will carry out observations ranging from hours to years to test mass loss models. They will also develop easy-to-use software tools for undergraduate students, making it easier for them to learn how to do research. Researchers from Florida and Tennessee will collaborate to complete the work, including students and a postdoctoral researcher.The team will use optical echelle spectrographs on moderate-sized telescopes with high resolving power (R=20,000) to study magnetic OB stars and several early-type binaries with colliding winds for 210 nights of dedicated time. The observations will provide equivalent velocity resolution of 15 km/s, which is high enough to see detailed structure in the massive star emission lines which are typically 1000-3000 km/s wide. They will use the data to test models of magnetospheric emission based on simulations of magnetized winds. They will also monitor a diverse selection of massive colliding wind binaries to quantify and model periodic and non-periodic behavior. The team will use telescopes in the Southern Association for Research in Astronomy (SARA), which is a consortium of 12 universities.

该团队将使用亚利桑那州和智利的望远镜收集大质量恒星喷出气体和尘埃的数据。这些物质最终会在新的星星和行星形成区循环利用。研究人员将测量两组恒星的恒星风变化：具有磁场的恒星和双星系统中的恒星。他们将进行从数小时到数年的观测，以测试质量损失模型。他们还将为本科生开发易于使用的软件工具，使他们更容易学习如何做研究。 来自佛罗里达和田纳西州的研究人员将合作完成这项工作，其中包括学生和一名博士后研究员。该团队将在具有高分辨率（R= 20，000）的中型望远镜上使用光学中阶梯光栅光谱仪，在210个夜晚的专用时间内研究磁性OB星和几个早期类型的双星。观测将提供15公里/秒的等效速度分辨率，这足以看到大质量星星发射线的详细结构，这些发射线通常为1000-3000公里/秒。他们将使用这些数据来测试基于磁化风模拟的磁层发射模型。他们还将监测大量碰撞风双星的各种选择，以量化和模拟周期性和非周期性行为。该团队将使用由12所大学组成的南方天文学研究协会（SARA）的望远镜。