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We present deep broad-band imaging and long-slit spectroscopy of threecompact, low-mass starburst galaxies at redshift z\sim0.2-0.3, also referred toas Green Peas (GP). We measure physical properties of the ionized gas andderive abundances for several species with high precision. We find that thethree GPs display relatively low extinction, low oxygen abundances, andremarkably high N/O ratios We also report on the detection of clear signaturesof Wolf-Rayet (WR) stars in these galaxies. We carry out a pilot spectralsynthesis study using a combination of both population and evolutionarysynthesis models. Their outputs are in qualitative agreement, stronglysuggesting a formation history dominated by starbursts. In agreement with thepresence of WR stars, these models show that these GPs currently undergo amajor starburst producing between ~4% and ~20% of their stellar mass. However,as models imply, they are old galaxies having had formed most of their stellarmass several Gyr ago. The presence of old stars has been spectroscopicallyverified in one of the galaxies by the detection of Mg I 5167, 5173 absorptionline. Additionally, we perform a surface photometry study based on HST data,that indicates that the three galaxies posses an exponential low-surfacebrightness envelope. If due to stellar emission, the latter is structurallycompatible to the evolved hosts of luminous BCD/HII galaxies, suggesting thatGPs are identifiable with major episodes in the assembly history of local BCDs.These conclusions highlight the importance of these objects as laboratories forstudying galaxy evolution at late cosmic epochs.

The star formation history and metal content of the "Green Peas". New detailed GTC-OSIRIS spectrophotometry of three galaxies