BV photometry in Draco molecular cloud

To investigate the distance and linear dimensions of the Draco Molecular Cloud (MBM 41) we have obtained new CCD photometry for a selection of stars in 20 selected areas toward...为研究天龙座分子云（Draco Molecular Cloud，MBM 41）的距离与线尺度，我们针对朝向……的20个选定天区内的一批恒星获取了全新的CCD测光（CCD photometry）数据。