Collaborative Research Using High Mass Binaries to Resolve the Mass Discrepancy: Taking Things to the Extreme

使用高质量双星解决质量差异的合作研究：将事情发挥到极致

• 批准号: 0506573
• 负责人: Douglas Gies
• 金额: --
• 依托单位: Georgia State University Research Foundation, Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0506573&HistoricalAwards=false
• 关键词: Collaborative; Research; Using; Mass; Binaries

AST-0506573Douglas GiesGeorgia State UniversityCollaborative Research Using High Mass Binaries to Resolve the MassDiscrepancy: Taking Things to the ExtremeABSTRACTAn observational program will be undertaken to determine the masses of the most massive stars.The work is motivated by significant (factors of two to three) differences in the masses of high massstars derived from evolutionary models compared with those calculated from atmosphericparameters (i.e, surface gravities from Balmer profiles combined with distance, reddening, andbolometric magnitudes). Thus, either problems remain with theories of high mass star evolution(important/unknown physical complications may have not be included), or with the spectroscopicapproach (incorrect surface gravities, luminosities, distances, etc. may be being used). To resolvethe question and ascertain the source of the discrepancy, the masses of binary O stars will bedirectly measured from an analysis of eclipsing double-lined spectroscopic binaries (specialattention will be paid to those with periods 3-5 days which have therefore not interacted). In thefirst year, young associations and clusters in the Milky Way and Magellanic Clouds will bephotometrically surveyed to find eclipsing binaries. Radial velocities for candidates will be obtainedin the second year. The third year will be used to find the orbit solutions, and to calculatespectroscopic and evolutionary masses for comparison with the results.This project includes a significant outreach and undergraduate research component. Thephotometric data (its acquisition for the northern fields and reduction for both northern and southerntargets) will be part of a key project of the National Undergraduate Research Observatory.Undergraduate students in Northern Arizona University Research Experiences for Undergraduatesprogram and MIT field camp will help with the spectroscopic observations and orbit solutions.

AST-0506573 Douglas giesgeorgia州立大学的研究研究使用高批量的二进制文件来解决大规模扫描次数：将事情带到极端的观察计划中，将进行最大程度的巨大明星的群众。 （即，来自Balmer轮廓的表面重力以及距离，红色和效率测量幅度的结合）。因此，与高质量恒星进化的理论有关（可能不包括重要/未知的身体并发症），也可能存在光谱镜（可能使用不正确的表面重力，亮度，距离等）。为了解决问题并确定差异的来源，二元O恒星的质量将通过对黯然失色的双线光谱二进制文件的分析来依次测量（将对那些没有相互作用的3-5天的时间进行特殊说明）。在第一年，以银河系和麦哲伦云的年轻协会和群集将进行蜂鸣器测量，以发现黯然失色的二进制文件。第二年将获得候选者的径向速度。第三年将用于找到轨道解决方案，并计算光谱和进化群众以与结果进行比较。本项目包括重要的外展和本科研究组件。票据测量数据（其北部和南部城市的北部和南部田地减少）将成为国家本科研究天文台的一个关键项目的一部分。亚利桑那州北部大学的大学生研究经验，用于本科生和MIT实地营地的研究经验，将有助于群体学观察和Orbit Spectroscic obscopic obscopics and Orbit Solutions。