IPHAS: The INT/WFC Photometric H-alpha Survey of the Northern Galactic Plane
H-alpha emission both traces diffuse ionised nebulae and is commonly prominent in the spectra of pre- and post-main-sequence stars and interacting binaries. Since these are mostly relatively short-lived phases of evolution, they represent a minority of objects in a mature galaxy like our own at any one time. In the case of interacting binaries
Walton, N. A. et al.
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2004