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Cluster star-forming galaxies are found to have an excess of Far-Infraredemission relative to H-alpha (Ha), when compared to those in the field, whichcould be caused by intense AGN activity, dust and/or declining star formationhistories. Here we present spectroscopic observations of Ha emitters in the Cl0939+4713 (Abell 851) super-cluster at z=0.41, using AF2+WYFFOS on the WHT. Wemeasure [OII], Hbeta (Hb), [OIII], Ha and [NII] for a sample of 119 Ha emittersin and around the cluster. We find that 17+-5% of the Ha emitters are AGN,irrespective of environment. For star-forming galaxies, we obtain Balmerdecrements, metallicities and ionisation parameters with different methods,individually and by stacking. We find a strong mass-metallicity relation at allenvironments, with no significant dependence on environment. The ionisationparameter declines with increasing stellar mass for low-mass galaxies. Haemitters residing in intermediate environments show the highest ionisationparameters (along with high [OIII]/Ha and high [OIII]/[OII] line ratios,typically twice as large as in the highest and lowest densities), which declinewith increasing environmental density. Dust extinction (A$_{H\alpha}$)correlates strongly with stellar mass, but also with environmental density.Star-forming galaxies in the densest environments are found to be significantlydustier (A$_{H\alpha}$~1.5-1.6) than those residing in the lowest densityenvironments (A$_{H\alpha}$~0.6), deviating significantly from what would bepredicted given their stellar masses.

The nature of H-alpha star-forming galaxies at z~0.4 in and around Cl 0939+4713: the environment matters