Abstract
IPHAS is a deep, fully photometric H α survey of the northern Galactic plane carried out with the Isaac Newton telescope at La Palma. The IPHAS point source Hα catalogue (complete up to r=19.5 mag) will be a prime source for GTC programs related to important short-lived (and poorly known) stages of evolution: pre- and post-main sequence stars, the most massive stars, binary stars, etc. IPHAS will also allow good demography of Hα extended nebulae (PNe, HII regions, SNR, H-H objects) avoiding biases from incomplete samples or pathologic objects.
