6 Summary and conclusion

We present H$\alpha$+[NII] imaging data (fluxes and equivalent widths) of 122 galaxies obtained at the 1.20 m telescopes of the Observatoire de Haute Provence (OHP) and of Calar Alto. The present observations of late-type galaxies in the Virgo cluster are aimed at completing a large project of multifrequency observations of galaxies spanning a large range in morphological type and luminosity and belonging to different environments (cluster-isolated) aimed at constructing a data-set suitable for statistical studies.

Acknowledgements

We wish to thank the night operators for their assistance during the observations and the OHP and Calar Alto TACs for the generous time allocation. We thank R. Kennicutt for providing us with unpublished data and J. Iglesias-Paramo for helping during the preparation of the figures. This project is partly financed by the French GdR Galaxies and PNG.