Extended Red Emission (ERE) in Planetary Nebulae

行星状星云中的扩展红色发射 (ERE)

• 批准号: 8814987
• 负责人: Adolf Witt
• 金额: $ 4万
• 依托单位: University of Toledo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-12-01 至 1991-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8814987&HistoricalAwards=false
• 关键词: Extended; Red; Emission; ERE; Planetary

Extended red emission (ERE) is a dust luminescence process which has recently been attributed to photoluminescence by hydrogenated amorphous carbon. If its presence can be demonstrated on a galactic scale and, in particular, in dust forming environments, ERE must be considered direct observational evidence for the presence and physical structure of an important dust compound, that is, amorphous carbon. Planetary nebulae are recognized as one of the major sources of new interstellar dust, and there is some evidence that ERE is very likely to be present in many of these objects. Planetary nebulae also exhibit evidence for substantial dust grain processing. Dr. Witt will carry out observational studies of the optical continuum in the wavelength range of 3200 to 10,000 Angstroms of 24 planetary nebulae. His aim is to investigate the strength and the spectrum of ERE as a function of the carbon to oxygen ratio in these nebulae and as a function of the size distribution of the dust grains present.

延长的红色发射（ERE）是一种尘埃发光过程，最近归因于氢化无定形碳的光致发光。 如果可以在银河系中，尤其是在粉尘形成环境中证明其存在，则必须将其视为直接观察证据，证明重要的灰尘化合物的存在和物理结构，即无定形碳。 行星星云被认为是新的星际尘埃的主要来源之一，并且有证据表明，许多物体中很可能存在。 行星星云还表现出大量灰尘颗粒加工的证据。 Witt博士将在3200至10,000个行星星云的波长范围内对光学连续体进行观察性研究。 他的目的是研究这些星云中碳与氧之比的强度和频谱，以及存在尘埃粒的大小分布的函数。