Photoelectric search for CP2-stars in open clusters. V - NGC 6281, NGC 6405, IC 4665

Astronomy and Astrophysics – Astrophysics

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A Stars, Electrophotometry, Magnetic Stars, Open Clusters, Peculiar Stars, Stellar Spectrophotometry, Interstellar Extinction, Visual Photometry

Scientific paper

130 stars in the medium age clusters NGC 6281, NGC 6405, and IC 4665 were observed by photoelectric photometry in the Delta a-system (Maitzen, 1976) in order to detect CP2-peculiarity by the presence of the lambda 5200 depression feature. No CP2-star was found in IC 4665, one in NGC 6281, and 3 in NGC 6405. Star No. 77 of NGC 6405 exhibits the strongest lambda 5200 depression ever measured by this type of photometry. The (very small) reddening correction of the a-values is discussed and found to agree well with previous papers of this series.

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