Probing Circumstellar Envelopes with Gravitational Microlensing

用引力微透镜探测星周包层

• 批准号: 9986915
• 负责人: Richard Ignace
• 金额: $ 19.6万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-01 至 2002-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9986915&HistoricalAwards=false
• 关键词: Probing; Circumstellar; Envelopes; Gravitational; Microlensing

ABSTRACTIgnace, Richard"Probing Circumstellar Envelopes with Gravitational Microlensing"AST-9986915In this project a theoretical basis and observational methodology will be developed for interpreting stellar gravitational microlensing events that are discovered in the course of ongoing monitoring campaigns. Such events in principle can be used to 'gravitationally image' otherwise unresolvable stellar photospheric and circumstellar structures when an invisible but massive object passes between the observer and a background star. Current microlensing techniques are useful only by assuming normal symmetrical stellar photospheres. The PIs will extend the technique to include microlensing events that involve red giant stars. The latter have highly asymmetrical atmospheric structure, winds, and variations in envelope size, velocity and density. The technique developed also may be useful in categorizing lensing events in the nuclei of other nearby normal galaxies such as M31 and active galactic nuclei.Funding for this project was provided by the NSF program for Stellar Astronomy & Astrophysics (AST/SAA).

Richard，理查德（Richard）“用重力微透明的探测情节信封” AST-9986915在该项目中，将开发出一种理论基础和观察方法，用于解释在正在进行的监测运动过程中发现的恒星重力微验事件。 当观察者和背景恒星之间传递时，这些事件原则上可用于“重力图像”，否则无法避开的恒星光谱和偶色结构。 当前的微化技术仅通过假设正常的对称恒星光传感才能有用。 PI将扩展该技术，包括涉及红色巨星的微透明事件。 后者具有高度不对称的大气结构，风和密度的变化和变化。 开发的技术也可能在对附近其他正常星系（例如M31和主动银河系核）的核中分类中有用。该项目的资金由NSF计划提供，用于恒星天文学和天体物理学（AST/SAA）。