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

合作研究：RUI：OB 星驱动红外弓震的质量损失率

• 批准号: 2108349
• 负责人: Matthew Povich
• 金额: $ 19.06万
• 依托单位: Cal Poly Pomona Foundation, Inc.
• 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=2108349&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; Mass; Loss

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.

首席研究员 (PI) Kobulnicky 和 ​​Povich 将改进对大质量恒星风驱动质量损失的测量。 就像一艘船在水中移动一样，恒星风与星际介质碰撞并产生弓震。 PI 将教授加州理工波莫纳分校和怀俄明大学的数百名本科生以及怀俄明州兰德高中天文学俱乐部的成员如何参与在线 Zooniverse-Milky Way 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红外天文台 (WIRO) 和阿帕奇天文台 (APO) 的夏季观测计划。该团队将确定 400 多颗恒星的物理特性。由恒星风驱动的后主序质量损失会影响恒星结构、化学产率、超新星的光变曲线以及致密天体的形成。 PI 应用恒星风撞击相对于恒星移动的周围星际介质之间的动量通量平衡原理来估计质量损失率。来自档案斯皮策太空望远镜、广域红外巡天探测器（WISE）和赫歇尔太空天文台数据集的众包测量结果将限制红外恒星弓激波星云的几何形状。与 GAIA 数据库交叉匹配将产生恒星距离和自行。学生将减少并分析使用 WIRO 摄谱仪和 APO Kitt Peak 俄亥俄州立多目标摄谱仪 (KOSMOS) 采集的数据。该团队将为风驱动的恒星质量损失率制定一个基于经验的处方，作为恒星温度、重力、自转速率和演化阶段的函数，超过之前样本的四倍。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。