RT Journal Article T1 Mapping the star formation history of Mrk 86 - I. Data and models A1 Gil de Paz, Armando A1 Zamorano Calvo, Jaime A1 Gallego Maestro, Jesús A1 Domínguez, F. de B. AB We have obtained optical (BVR, [O III]ƛ 5007 Å and H_α), near infrared (JHK) imaging and long-slit optical spectroscopy for the Blue Compact Dwarf galaxy Mrk 86 (NGC 2537). In this paper, the first of two, we present optical-near-infrared colors and emission-line fluxes for the currently star-forming regions, intermediate aged starburst and underlying stellar population. We also describe the evolutionary synthesis models used in Paper II. The R and H_α luminosity distributions of the galaxy star-forming regions show maxima at M-R = -9.5^m and L_H_α = 10^37.3 ergs^-l. The underlying stellar population shows an exponential surface brigthness profile with central value, μ_E,0 = 21.5 mag arcsec^-2, and scale, α=0.88 kpc, both measured in the R-band image. 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Miranda for obtaining the high resolution spectra, N. Cardiel for providing the reduceme package and C.E. García Dabó for the PlateAstrom routine. We also thank A. Alonso Herrero for her help in the acquisition and reduction of the nIR images. We also acknowledge the anonymous referee for several helpful comments. Finally, we thank to C.E. García Dabó and J. Cenarro for stimulating conversations, and M. Sharina for providing a reprint copy of her article. This research has been supported in part by the grants PB93-456 and PB96-0610 from the Spanish ’Programa Sectorial de Promoción del Conocimiento’. A. Gil de Paz acknowledges the receipt of a ’Formación del Profesorado Universitario’ fellowship from the spanish ’Ministerio de Educación y Cultura’. NO Programa Sectorial de Promoción del Conocimiento (MEC), España NO Ministerio de Educación y Cultura (MEC), España NO Programa de Formación del Profesorado Universitario (FPU) DS Docta Complutense RD 30 abr 2024