Abstract 87 stars in the NGC 6913 field with both UBV and Vilnius photometry are selected to be the sample. The membership probability of the stars is greater than 50%. The correlation among Vilnius photometry, UBV photometry and reddening in the cluster is reviewed. It is found that the photometry in the Vilnius X, Y and Z bands can be used to make rough spectral classification. The values of E(B-V) are well correlated with the Vilnius colors of X-Y, Y-Z, Z-V and V-S in NGC 6913. The ratio of (V-S)/(Y-Z) of the MPCM (Most Possible Cluster Members) is a constant (1.30 ∼ ±0.06), and has no effect on the values of E(B-V), (B-V)0 and V0. Comparing with the observational data of all the stars of NGC 6913 region, we propose that the value of (V-S)/(Y-Z) can probably be used to select the preliminary candidates of one open cluster. In addition, 12 variable stars are discovered in the NGC 6913 region, in which star #155 has a variation with an amplitude of 4.25 mag.

Keywords Galaxy: open clusters and associations --- ISM: dust, extinction

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