The spectral distribution of stars magnitude 7-0 and brighter in the Henry Draper catalogue. Part I. Text and tables

The distribution of stars of mag. 7-0 and brighter of the H. D. C. is here studied in the system of galatic co-ordinates. There are tables of numbers of stars according to both the co-ordinates for individual clases of magnitude and for all the spectral subdivisions. Also the distribution of the density of stars in longitude and latitude separately is studied for the spectral classes B, A, F, G, …