Binary Star Formation

双星形成

• 批准号: 9616093
• 负责人: Alan Boss
• 金额: $ 7.8万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-15 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616093&HistoricalAwards=false
• 关键词: Binary; Star; Formation

Boss, Alan AST 96-16093 Recent observational evidence indicates that stars form in pairs, or as binary systems, rather than singly, like our sun. Conditions required to form binary stars are poorly understood, and most theoretical modeling has concentrated on studying single star formation. Dr. Boss will rectify this situation by carrying out research into the processes that lead to binary star formation. His program will improve understanding of the fragmentation process which occurs during protostellar collapse in molecular clouds, and his theoretical models will include effects such as mass accretion, orbital mergers and initial magnetic fields, all previously neglected in theoretical treatments, but recognized to be potentially important. His work will follow the orbital evolution of the binary fragments for much longer times than is typical in models, as the fragments interact with the residual disk and cloud envelope. Dr. Boss's work is closely tied to observations, both through the initial conditions of his models and through the resulting calculation of line emission from the protostellar fragments for comparison with observations of star-forming regions. His results will also allow the determination of the minimum mass of a protostellar fragment, which has bearing on the discrimination between brown dwarf stars and giant planets, and the interpretation of recent observational detection of companions to solar-type stars. ***

最近的观测证据表明，恒星是成对形成的，或者是双星系统，而不是像我们的太阳那样单独形成的。人们对形成双星所需的条件知之甚少，大多数理论建模都集中在研究单星的形成上。博斯博士将通过对导致双星形成的过程进行研究来纠正这种情况。他的项目将提高对分子云中原恒星坍缩过程中发生的破碎过程的理解，他的理论模型将包括质量吸积、轨道合并和初始磁场等效应，这些效应以前在理论处理中被忽视，但被认为是潜在的重要因素。他的工作将跟踪双星碎片的轨道演变，比典型的模型要长得多，因为碎片与剩余的磁盘和云包层相互作用。博斯博士的工作与观测密切相关，无论是通过他的模型的初始条件，还是通过计算原恒星碎片的线发射，以便与恒星形成区域的观测结果进行比较。他的研究结果还将有助于确定原恒星碎片的最小质量，这将影响到棕矮星和巨行星之间的区别，并解释最近观测到的太阳型恒星的伴星。＊＊＊