UBV(I)c photometry of NGC 6996

We present and discuss broad band CCD UBV(I)c photometry and low resolution spectroscopy for stars in the region of the open cluster NGC 6996, located in the North America...本文介绍并探讨了位于北美地区的疏散星团NGC 6996天区内恒星的宽带电荷耦合器件(CCD) UBV(I)c测光数据与低分辨率光谱。