Globular Cluster Ngc6656 The Hst Wfpc2 Photometry And Kinetic Studies

Being one of the nearest globular cluster,NGC665 6 was observedby the ground—based equipment very early.But people can only take eyeson its outlier limited by the resolution of the telescope. This thesis is concerned with space·-based high--resolution opticalimaging of globular cluster cores,and the subsequent application ofimage—restoration and crowded—field photometry techniques,thus we maygain an improved understanding of the nature of the dynamics of globularclusters and the galaxies.We use the two epoch and filtlers observationdata to calculate the proper motion of cluster relative to the bulge starsand derive the space velocity and orbit of NGC 6656 under the givengravitational potential of the Milky Way.Compared to the former works,the discusses or comments are given. We calibrated two band photometry of liST WFPC2 observation on the cluster,and then transferred them into the standard ground—based Landolt system.By the new theory of the stellar evolution and new ischrone method to fit the age of the cluster,some adhered astrophysical quantities like the distance modulus and mass-to light ration are also calculatrd.