Fig. 3.
Spectra of brigthest blue stars in field of cluster, taken with ISIS (Stars 4, 47, and 51), IDS (22 and 35) and FEROS (1, 7, 28, and LS193). The most important lines in this spectral region are marked. It is important to note the increasing width of the Balmer lines as we move from giants to main sequence among the mid-B stars.
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