Stromgren photometry of open clusters. I - NGC 6281, NGC 6405

Astronomy and Astrophysics – Astrophysics

Scientific paper

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A Stars, B Stars, Open Clusters, Stellar Spectrophotometry, Astronomical Catalogs, Early Stars, Peculiar Stars, Ubv Spectra

Scientific paper

Stromgren indices for A-type and B-type stars in the southern open clusters, NGC 6281 and NGC 6405, are presented. Their membership is discussed and the reddening of the clusters is estimated. It is shown that shifting of the main sequence to the standard relation of Crawford (1975, 1978, 1979) yields a reddening of E(b-y) = 0.120 for NGC 6281 and a reddening of E(b-y) = 0.110 for NGC 6405. The occurrence of a CP1(Am) and a Delta-Sct star in NGC 6405 is considered. The results of the Stromgen photometry are given in tables.

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