The Stars in Camelopardalis OB1: Their Distance and Evolutionary History

An investigation is undertaken of the optically identified Population I objects in the Cam OB1 region. From the analysis of these objects it is determined that the distance to the Cam OB1 stars is 975+/-90 pc. A theoretical H-R diagram for the Cam OB1 stars reveals that star formation has been going on in the region for 1×10⁶-1×10⁸ yr. At present, the most active site of star formation is Cam R1, which shows an asymmetry in the distribution of optically identified Population I objects. The majority of the pre-main-sequence stars lie in the northern half of the association, while the main-sequence stars and evolved stars lie in the southern half.