High Signal-to-Noise CCD Spectroscopy of Interstellar Absorption Lines

星际吸收线的高信噪比 CCD 光谱学

• 批准号: 9021641
• 负责人: David Meyer
• 金额: $ 8.07万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-05-01 至 1994-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9021641&HistoricalAwards=false
• 关键词: Signal; Noise; CCD; Spectroscopy; Interstellar

Recent advances in CCD detector technology have made it possible to obtain high signal-to-noise, high resolution spectra of stars in wavelength and stellar brightness regimes that have seldom been explored. Dr. Meyer will use the latest generation of CCDs and high resolution spectrographs at the National Optical Astronomy Observatories to push the sensitivity of interstellar absorption line studies. Such studies impact on a variety of issues concerning the cosmic microwave background radiation, Big Bang nucleosynthesis, Galactic chemical evolution, and the structure, composition, and chemistry of the interstellar medium. Dr. Meyer's principal goals are to obtain a detailed understanding of the cosmic and local excitation of the CN molecule in diffuse interstellar clouds and to investigate the small-scale structure in the interstellar medium through observations of the interstellar absorption lines toward resolvable binary star systems.

CCD探测器技术的最新进展使人们能够获得很少被探索的波长和恒星亮度范围内的高信噪比、高分辨率光谱。迈耶博士将使用国家光学天文台最新一代的ccd和高分辨率光谱仪来提高星际吸收线研究的灵敏度。这些研究影响了宇宙微波背景辐射、大爆炸核合成、银河系化学演化以及星际介质的结构、组成和化学等各种问题。Meyer博士的主要目标是详细了解漫射星际云中CN分子的宇宙和局部激发，并通过观测可分辨双星系统的星际吸收线来研究星际介质中的小尺度结构。