Spectral Classification of Stars in VI Cygni (cygnus OB2)

Two-dimensional spectral classifications have been obtained for seven 0 stars in the interesting association VI Cygni. One of them, star No. 7, is of type 03 If* it is the second known member of this new category, and the first in the northern hemisphere. Its spectrum is illustrated. A distance of 1800 pc to the association is derived. Subject headings:associations - Of stars - spectral classification - stars, individual