Stellar Content of the GSH 224-01+24 /Seagull Nebula Region

The Canis Major star-forming field is dominated by the extended Seagull Nebula and contains a number of HI shells, associated with both the Local or Perseus arms. The positional coincidence of the bright O and B stars in this direction and one of the major shells in the region, GSH 224-01+24, may be indicative of an interaction with the shell’s  material. We use a sample of 260 bright O-B9 type field stars that is about 90% complete up to 12 magnitude and involve uvbyβ photometry and the Gaia EDR3 data to study the distribution of the bright young stars in this region.