Collaborative Research: Mass-Loss Rates for OB Stars Driving IR Bowshocks

合作研究：OB 星驱动红外弓震的质量损失率

• 批准号: 2108347
• 负责人: Henry Kobulnicky
• 金额: $ 28.15万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-15 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108347&HistoricalAwards=false
• 关键词: Collaborative; Research; Mass; Loss; Rates

Principal Investigators (PIs) Kobulnicky and Povich will improve measurements of wind driven mass loss from massive stars. Just like a boat moving through water, a stellar wind collides with the interstellar medium and creates a bowshock. The PIs will teach several hundred undergraduate students at Cal Poly Pomona and the University of Wyoming, and members of the Wyoming Lander high school astronomy club how to participate in the online Zooniverse-Milky Way Project. Students will analyze infrared images and characterize the bow shocks. University students will also participate in a summer observing program at the Wyoming Infrared Observatory (WIRO) and the Apache Observatory (APO). The team will determine the physical properties of over 400 stars.Post-main-sequence mass loss driven by stellar winds effects the stellar structure, chemical yield, the light curve of the supernova, and the formation of a compact object. The PIs apply the principle of momentum flux balance between a stellar wind impinging upon an ambient interstellar medium moving relative to the star to estimate the mass loss rate. The crowd-sourced measurements from archival Spitzer Space Telescope, Wide-field Infrared Survey Explorer (WISE) and Herschel Space Observatory datasets will constrain the geometry of the infrared stellar bow shock nebulae. Cross-matching with the GAIA database will yield stellar distances and proper motions. Students will reduce and analyze the data taken with the WIRO spectrograph and the APO Kitt Peak Ohio State Multi-Object Spectrograph (KOSMOS). The team will produce an empirically based prescription for wind-driven stellar mass-loss rates as a function of stellar temperature, gravity, rotation rate, and evolutionary stage, more than quadrupling previous samples.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

主要研究人员（PIS）Kobulnicky和Povich将改善对大型恒星的风驱动质量损失的测量。 就像一条船在水中移动一样，一场恒星的风与星际介质相撞并产生了弓箭。 PIS将在Cal Poly Pomona和Wyoming大学教授数百名本科生，以及怀俄明州Lander高中天文学俱乐部的成员如何参加在线的西诺弗斯 - 米尔基路项目。学生将分析红外图像并表征弓形冲击。大学生还将参加怀俄明州红外天文台（WIRO）和Apache天文台（APO）的夏季观测计划。该团队将确定超过400颗星的物理特性。由恒星风驱动的备用序列质量损失会影响恒星结构，化学产量，超新星的光曲线以及紧凑物体的形成。 PI应用了恒星风在环境星际介质相对于恒星的恒星风之间的原理，以估计质量损失率。档案中的Spitzer太空望远镜，广阔的红外调查探险器（WISE）和Herschel太空天文台数据集的人群测量结果将限制红外恒星弓形冲击星云的几何形状。与GAIA数据库进行交叉匹配将产生出色的距离和适当的动作。学生将减少和分析使用Wiro光谱仪和Apo Kitt Peak Ohio State Multi-Objectraggh（KOSMOS）获取的数据。该团队将制定基于经验的风向恒星质量损失率的处方，这是恒星温度，重力，旋转速度和进化阶段的函数，而不仅仅是四倍的先前样本。这一奖项反映了NSF的法定任务，并被认为是通过基金会的知识优点和广泛影响的评估来评估的值得支持的。