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In this paper we present a multicolor photometry for A2589 ($z=0.0414$) with15 intermediate bands in the Beijing-Arizona-Taiwan-Connecticut (BATC) systemwhich covers an optical wavelength range from 3000 \AA\ to 10000 \AA. Thespectral energy distributions (SEDs) for more than 5000 sources are achieveddown to {\it V} $\sim$ 20 mag in about 1 deg$^{2}$ field. A2589 has been alsocovered by the Sloan Digital Sky Survey (SDSS) in photometric mode only. Across-identification of the BATC-detected galaxies with the SDSS photometriccatalog achieves 1199 galaxies brighter than $i=19.5$ mag, among which 68member galaxies with known spectroscopic redshifts are found. After combiningthe SDSS five-band photometric data and the BATC SEDs, the technique ofphotometric redshift is applied to these galaxies for selecting faint membergalaxies. The color-magnitude relation is taken as a further restriction ofearly-type cluster galaxies. As a result, 106 galaxies are newly selected asmember galaxies. Spatial distribution of member galaxies shows a north-southelongation which agrees with the X-ray brightness profile and the orientationof central cD galaxy, NGC 7647. No substructures are detected on the basis ofpositions and radial velocities of cluster galaxies, indicating that A2589 is awell-relaxed system. The luminosity function of A2589 exhibits a peak at $M_{R}\sim -20$ mag and a dip at $M_{R} \sim -19 $ mag. The low-density outer regionsare the preferred habitat of faint galaxies. With the evolutionary populationsynthesis model, PEGASE, the environmental effect on the star formationproperties for 68 spectroscopically confirmed member galaxies is studied. Theoutlier faint galaxies tend to have longer time scales of star formation,shorter mean stellar ages, and lower metallicities of interstellar medium,which can be interpreted in the context of hierarchical cosmological scenario.

Multicolor Photometry Study of the Galaxy Cluster A2589: Dynamics, Luminosity Function and Star Formation History