Faint early-type stars and emission-line stars in the Canis Majoris complex.

In order to study the distribution of OB stars in the Canis Majoris complex, a survey and classification have been done for stars in the area. The study is based on spectral observations at the Kiso Schmidt tlescope. In the present field about 1800 OBA stars were classified, where the majority is dominated by B late and A early type stars. A survey for emission-line stars was also carried out in the same region. In total, 128 emission-line stars were detected, ranging from V = 6 to 15. A comparison shows that some emission-line stars of this region contained in the existing catalogs are common with the authors', and some exhibit no detectable emission line on the plates. This can probably be considered as the result of variation in emission-line strength.