Radiative and Collisional Atomic Data for Singly Ionized Iron (FEII)

研究人员将对离子Fe+的辐射跃迁概率和碰撞散射截面进行理论计算。这种离子的谱线支配着许多天体物理光谱，并使之复杂化。使用Cray 2计算机比以往任何项目都要精确得多。大多数关于恒星的信息都来自于对其光谱的分析。但是由于铁离子Fe+的作用，许多恒星的光谱被数百条谱线复杂化。修正这些谱线需要详细计算铁离子的原子水平和它们之间的各种跃迁。现在使用克雷2号超级计算机可以计算出所需的精度。普拉丹拥有计算机代码，以及在目前的资助下完成这项计算所需的有益的国内和国际合作。

The investigators will carry out theoretical calculations of radiative transition probabilities and collisional scattering cross sections for the ion Fe+. The lines from this ion dominate and complicate many astrophysical spectra. Use of a Cray 2 computer allows vastly greater accuracy than any previous projects. Most information about stars is derived from an analysis of their spectra. But many stellar spectra are complicated by hundreds of spectrum lines due to the iron ion Fe+. Correction of these lines requires a detailed calculation of the atomic levels of Fe+ and various transitions between them. A calculation of the required accuracy is now possible by use of a Cray 2 supercomputer. Pradhan has the computer codes and helpful national and international collaborations needed to accomplish this calculation under the present grant.