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We present Halpha3 (acronym for Halpha-alpha-alpha), an Halpha narrow-bandimaging survey of ~400 galaxies selected from the HI Arecibo Legacy Fast ALFASurvey (ALFALFA) in the Local Supercluster, including the Virgo cluster. Byusing hydrogen recombination lines as a tracer of recent star formation, we aimto investigate the relationships between atomic neutral gas and newly formedstars in different environments (cluster and field), morphological types(spirals and dwarfs), and over a wide range of stellar masses (~10^7.5-10^11.5Msun). We image in Halpha+[NII] all the galaxies that contain more than 10^7Msun of neutral atomic hydrogen in the sky region 11^h < R.A. <16^h 4^o < Dec.<16^o; 350< cz <2000 km/s using the San Pedro Martir 2m telescope. This surveyprovides a complete census of the star formation in HI rich galaxies of thelocal universe. We present the properties of the galaxy sample, together withHalpha fluxes and equivalent widths. We find an excellent agreement between thefluxes determined from our images in apertures of 3 arcsec diameter and thefluxes derived from the SDSS spectral database. From the Halpha fluxescorrected for galactic and internal extinction and for [NII] contamination wederive the global star formation rates (SFRs).

Halpha3: Halpha imaging survey of HI selected galaxies from ALFALFA