Near-Infrared Spectroscopy of Young Stellar Objects

年轻恒星物体的近红外光谱

• 批准号: 9114940
• 负责人: Alan Tokunaga
• 金额: $ 5.67万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-01 至 1997-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9114940&HistoricalAwards=false
• 关键词: Near; Infrared; Spectroscopy; Young; Stellar

One of the most reliable signatures of the youngest observable stars is the emission of their infrared CO spectral lines from a wind or a pair of collimated bipolar jets. The source of this energetic outflow is still unknown, but there are reasons to believe that the energy for this particle ejection comes from the infall of matter from a circumstellar accretion disk. The matter is then deflected by a combination of magnetic and stellar rotation forces and ejected in a collimated flow. The object of this proposal is to study the emission profiles of CO, hydrogen, oxygen, and lines of other elements in order to test the correctness "x-celerator" model. The Principal Investigator and his Co-Investigator have just constructed a high dispersion infrared spectrograph that they will use for this program at the infrared telescopes on Mauna Kea Observatory, Hawaii. They will use their data to constrain the kinematical models for observed flows and work closely with the originator of the x-celerator model, Dr. Frank Shu of U. Calif. Berkeley. The results of this investigation are expected to have application not only to young stars but to other sites where bipolar jets have been observed, such as the nuclei of "active" galaxies.

最年轻的可观测恒星最可靠的特征之一是它们的红外CO谱线是从风或一对准直的双极喷流发出的。这种能量外流的来源尚不清楚，但有理由相信，这种粒子抛射的能量来自于来自恒星周吸积盘的物质流入。然后，物质在磁力和恒星旋转力的共同作用下偏转，并在准直流动中被抛出。这项建议的目的是研究CO、氢、氧和其他元素的谱线的排放分布，以检验“x加速器”模型的正确性。首席调查员和他的合作调查员刚刚建造了一台高分散红外光谱仪，他们将在夏威夷莫纳克亚天文台的红外望远镜上用于这个项目。他们将使用他们的数据来约束观测到的流动的运动学模型，并与x-celerator模型的发起人加州大学的Frank Shu博士密切合作。伯克利。这项研究的结果预计不仅适用于年轻恒星，而且还适用于其他观测到两极喷流的地点，例如“活跃”星系的核心。