星际弥散带是叠加在星际消光曲线上、源自星际空间的大量的吸收谱线的总称。星际弥散带的证认九十年来一直是天体物理中的一个未解之谜, 是天文学、物理学和化学等多学科交叉的重要研究领域；其研究,对于揭示星际弥散带的起源和星际介质的化学组成、了解不同星系的物理、化学环境具有重要的科学意义。本项目将以银河系天体为主要研究对象,（１）观测、收集星际弥散带资料,建立星际弥散带数据库,（２）利用远紫外2175埃星际吸收驼峰和星际弥散带的数据,研究星际弥散带与2175埃吸收驼峰以及其它星际消光参量之间的相关性，（３）研究星际弥散带之间的相关性，（４）研究星际弥散带与星际介质其它物理化学参量间的统计关系。根据统计分析结果,对星际弥散带进行分类,寻找星际弥散带的起源与载体。本项目还将对大、小麦哲仑云天体中的星际弥散带和2175埃吸收峰进行研究,探究星系物理环境对星际弥散带和2175埃吸收峰强度的影响。

Diffuse interstellar bands （DIBs）are a large number of absorption bands that are superposed on the interstellar extinction curve and are of interstellar origin. The identification of the diffuse interstellar bands has been an unsolved mystery for 90 years, and an important field of interdisciplinary studies in astronomy, physics and chemistry. This study would be significant for revealing their origin and the chemical composition of the interstellar medium, and for understanding the physical and chemical environments of external galaxies. In this project, we will focus on the Milky Way and (1) observe and collect from the literature a large sample of DIBs to build a DIB database "library"; (2) investigate the correlations between DIBs and the 2175 angstroms extinction as well as the the far-ultraviolet extinction rise; (3) explore the correlations among the DIBs; (4) explore the relationship between DIBs and the other interstellar physical and chemical parameters, and accordingly we will classify DIBs into families, and place constraints on their possible carriers. We will also study DIBs, the 2175 angstrom extinction bump, and the far-ultraviolet extinction rise in the Large Magellanic Cloud and Small Magellanic Cloud. This will allow us to explore the effects of the physical environment on DIBs and the 2175 angstroms bump.