H[alpha] Emission Stars in the Cepheus OB3 Region

Hα emission objects were searched for, using the objective-prismSchmidt plates in a 36 deg^sup 2^ sky area covering the Cepheus OB3 association.Hundred and eight emission stars have been found, 68 of which are newfindings to our knowledge. The properties of the IRAS point sourcesidentified with Hα emission stars indicate that most of theHα emission stars are T Tauri stars or related objects. Hαemission stars associated with IRAS sources and those unassociated havedifferent distributions, suggesting an age sequence among them.Altogether, they show a ring- or shell-like surface distribution, whichalmost coincides with that of heated dusts, and these distributionsappear to be encompassed by an HI shell.[PUBLICATION ABSTRACT]