J − Ks, J diagram of all the stars in the imaged field. Filled circles correspond to early-type candidates selected through the Q criterion described in Sect. 4. The location of very early-type stars of different spectral types at the distance of RAFGL 5475 obscured by varying amounts of foreground extinction is indicated with the dotted lines, and their unreddened magnitudes at that distance are given as the solid line near the top left edge of the diagram. The corresponding lines for a hypothetical population at the distance of M 16 and M 17 would be shifted upwards by 1.5 mag. The total length of each line corresponds to a visual extinction AV = 20 mag.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.