A search for AP stars in open clusters.

Abstract

Low-dispersion spectrograms of 62 stars in 13 open clusters have been observed in the intrinsic color range -0.13 < B - V < +0.06 in order to search for Ap stars. The purpose is to contribute to the statistics of the occurrence of Ap stars in homogeneous age groups, which is necessary as a critical test for some theories regarding the nature of Ap stars. Three new Ap stars are positively identified (all silicon-enhanced), and six other marginal candidates are noted. Subject headings: open clusters - peculiar A stars