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We present a long-slit spectroscopic analysis of Herbig-Haro 202 and thesurrounding gas of the Orion Nebula using data from the Very Large Telescope.Given the characteristics of the Orion Nebula, it is the ideal object to studythe mechanisms that play a role in the evolution of H II regions, notably dustdestruction by interstellar shocks, which is a poorly understood subject. Theuse of long-slit allowed us to determine the spatial variation in its physicalconditions and chemical abundances observing a broad area of the Orion Nebula;our results are consistent with those from previous studies albeit withimproved uncertainties in some determinations. Special attention is paid toIron (Fe) and Oxygen (O) abundances, which show a peak at the apex of theshock, allowing us to estimate that 57% of the dust is the destroyed at thisposition; we also calculate the amount of depletion of oxygen in dust grains,which amounts to 0.126 +/- 0.024 dex. Finally we show that O abundancesdetermined from collisionally excited lines and recombination lines areirreconcilable at the center of the shock unless thermal inhomogeneities areconsidered along the line of sight in the form of the t^2 parameter proposed byPeimbert (1967).

VLT Spectroscopic Analysis of HH 202. Implications on dust destruction and thermal inhomogeneities