New photometric data for the red giants in the open cluster NGC 5822 - Membership, chemical composition and physical properties

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Chemical Composition, Open Clusters, Red Giant Stars, Stellar Composition, Stellar Physics, Stellar Spectrophotometry, Abundance, Cyanogen, Electrophotometry, Interstellar Extinction, K Stars, Stellar Evolution, Ubv Spectra

Scientific paper

New photoelectric UBV, DDO, and CMT1T2 data of 14 G and K stars in the field of the open cluster NGC 5822 are presented. By applying two independent photometric criteria 11 stars are found to have a high probability of being cluster giants, while three remaining stars are almost certainly red field objects. A reddening E(B-V) = 0.15±0.01, a distance modulus of V0-MV = 8.77±0.18, and an age of about 6 - 8×108yr have been derived. NGC 5822 has a mean ultraviolet excess of δ(U-B) = 0.00±0.01, with respect to the field K giants, and a mean cyanogen anomaly of δCN = +0.031±0.008, both implying a nearly solar iron abundance. The effective temperatures, surface gravities and masses of the red giants have also been determined.

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