UBVRI CCD photometry of open clusters. II. NGC 6866

We have developed a maximum-likelihood procedure to fit theoretical isochrones to the observed cluster color-magnitude diagrams of NGC6866, an open cluster in the Kepler...我们已研发出一种最大似然法（maximum-likelihood procedure），可将理论等时线（theoretical isochrones）拟合至NGC 6866的观测星团色指数-星等图；该天体为开普勒（Kepler）观测范围内的一颗疏散星团（open cluster）。