Walraven photometry of OB stars

About 700 stars, mostly OB-stars, were observed by the author at the former Leiden Southern Station at Hartebees poortdam, South Africa, in the observing seasons 1965, 1968,...作者于南非哈特比斯波特达姆（Hartebeespoortdam）的原莱顿南方观测站（Leiden Southern Station），在1965年、1968年等观测季中，共观测了约700颗恒星，其中绝大多数为OB型星（OB-stars）。