Angular Momentum Destinies of Massive Stars

大质量恒星的角动量命运

• 批准号: 1009080
• 负责人: Douglas Gies
• 金额: $ 36.74万
• 依托单位: Georgia State University Research Foundation, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-10-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1009080&HistoricalAwards=false
• 关键词: Angular; Momentum; Destinies; Massive; Stars

This award will support an observational program to characterize the fundamental properties of massive stars. Dr. Gies and his team will conduct observations of the diameters and flattening of nearby massive stars, obtained with optical interferometry. The first part of this project will determine temperatures, radii, masses, and rotational velocities for a large sample of massive stars. The rotational speeds will be estimated through interferometric measurements of rotational flattening and spectroscopic measurements of the Doppler shifts related to rotation. The second part of the project will examine how close pairs of massive binary stars interact over time exchanging both mass and angular momentum. The observations for this project will be conducted using the Center for High Resolution Astronomy (CHARA) telescope array, located at Mt. Wilson, California. The project is expected to impact the wider field of stellar astrophysics because the observations will provide key tests of theoretical models for the rotational evolution of massive stars from youth to old age. The project will also involve graduate students at Georgia State University (GSU), and the results from this research will be incorporated into that institution's undergraduate curriculum. The PI also proposes to engage in education and outreach activities in coordination with the Mount Wilson Observatory, and the GSU Hard Labor Creek Observatory in Georgia.

该奖项将支持一个观察计划，以表征大型恒星的基本属性。 Gies博士及其团队将对通过光学干涉测量法获得的直径进行观察并扁平。 该项目的第一部分将确定大量大量恒星样本的温度，半径，质量和旋转速度。 旋转速度将通过与旋转相关的多普勒偏移的旋转平坦和光谱测量的干涉测量来估计。 该项目的第二部分将检查大量二进制恒星的近对，随着时间的流逝，质量和角动量交换。该项目的观察结果将使用位于加利福尼亚州威尔逊山的高分辨率天文学中心（CHARA）望远镜阵列进行。 预计该项目将影响恒星天体物理学的更广泛领域，因为观察结果将为从青年到老年的大型恒星旋转的理论模型提供关键测试。 该项目还将涉及佐治亚州立大学（GSU）的研究生，这项研究的结果将纳入该机构的本科课程中。 PI还建议与威尔逊山天文台和佐治亚州的GSU Hard Labor Creek天文台进行教育和外展活动。