High Resolution Imaging of O-Star Multiple Systems

一项正在进行的恒星形成过程的研究利用罗切斯特理工学院的2K x 2K冷却CCD相机对位于南半球和北半球协会核心的OB星团进行了成像。这些中央7‘ x 7’核心区域的UBVRI图像允许对初始质量函数的研究，其质量限制比先前确定的要低。在许多OB核心中，有一个中央的，明亮的o型星，或多星系统，主导着亮度。从CCD图像中可以明显看出，这些中心的o型星有比现有的双星和多星表（如ADS和IDS）多得多的伴星。中心星的亮度和点扩散函数的大小会对副星图像造成相当大的污染。对伴星进行精确的多波段光度测量，可以估算出它们的光谱类型，从而得出质量函数，从而更好地了解大质量恒星的形成过程和逃逸恒星的可能起源。使用菲利普斯实验室星火光学测距仪获得这些中心恒星及其伴星在一些OB星团中的高分辨率图像，并允许对这些数据进行简化和分析。* * *

ABSTRACT NINKOV, Zoran AST-9421606 An ongoing investigation into the star formation process has utilized the Rochester Institute of Technology 2K x 2K cooled CCD camera to image OB clusters that are at the core of associations in both the southern and northern hemispheres. These UBVRI images of the central 7' x 7' core regions have allowed study of the initial mass function to lower mass limits than previously determined. In many of these OB cores there is a central, luminous O-star, or multiple system, that dominates the brightness. From CCD images it is apparent that these central O-stars have many more companions than has been cataloged in existing double and multiple star catalogs (e.g. ADS and IDS). The brightness of the central star and the size of the point spread function results in considerable contamination of the secondary star image. Accurate multi-band photometry of the companions would allow for estimation of their spectral types and thus the mass function, and from this is a better understanding of the massive star formation process and the possible origin of runaway stars. The use of the Phillips Laboratory Starfire Optical Range to obtain high resolution images of these central stars, and their companions, in a number of OB clusters, and to permit the reduction and analyses of this data. * * *