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Fig. 6.

image

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.

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