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We present oxygen abundance measurements for 74 blue compact dwarf (BCD)galaxies in the redshift range in [0.2, 0.5] using the strong-line method. Thespectra of these objects are taken using Hectospec on the Multiple MirrorTelescope (MMT). More than half of these BCDs had dust attenuation correctedusing the Balmer decrement method. For comparison, we also selected a sample of2023 local BCDs from the Sloan Digital Sky Survey (SDSS) database. Based on thelocal and intermediate-z BCD samples, we investigated the cosmic evo- lution ofthe metallicity, star-formation rate (SFR), and Dn (4000) index. Com- paredwith local BCDs, the intermediate-z BCDs had a systematically higher R23 ratiobut similar O32 ratio. Interestingly, no significant deviation in themass-metallicity (MZ) relation was found between the intermediate-z and lo- calBCDs. Besides the metallicity, the intermediate-z BCDs also exhibited an SFRdistribution that was consistent with local BCDs, suggesting a weak de-pendence on redshift. The intermediate-z BCDs seemed to be younger than thelocal BCDs with lower D4000 index values. The insignificant deviation in themass-metallicity and mass-SFR relations between intermediate-z and local BCDsindicates that the relations between the global parameters of low-mass compactgalaxies may be universal. These results from low mass compact galaxies couldbe used to place important observational constraints on galaxy formation andevolution models.

The metallicity evolution of blue compact dwarf galaxies from the intermediate redshift to the local Universe