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00925njm 22002777a 4500 dc Alonso, O. author Zamorano Calvo, Jaime author Rego Fernández, Manuel author Gallego Maestro, Jesús author Vitores, A.G. author 1994 The most unambiguous way to discover new emission-line galaxies (ELGs) is directly by the presence of their lines, using objective-prism plates of adequate resolution. The first survey using this technique was developed by Smith in 1975 with the 0.6 m CTIO Curtis Schmidt Telescope. The Universidad Complutense de Madrid (UCM) is carrying out a survey of ELGs with the Schmidt Telescope at Calar Alto (Almería, Spain) using the presence of Ha in emission in IIIa-F prism plates as selection criterion. The observational procedure and results are described in Rego et al. 1989; Zamorano et al. 1990; Zamorano et al. 1993. The standard procedure is to scan the plates by eye, with a low-power binocular microscope. The use of different subjective criteria in the visual inspection can produce biased samples. Moreover, the visual scan does not produce any quantitative measure but only a sample of candidates. Therefore, in order to obtain an observer-independent sample and to extract the largest amount of information from the original plates, 2 plates have been scanned with the MAMA machine 1 (Guibert & Moreau 1991; Moreau 1992) with the aim of developing an automatic procedure to detect ELGs spectra. 0-7923-2878-7 10.1017/S0074180900048191 https://hdl.handle.net/20.500.14352/61053 https://doi.org/10.1017/S0074180900048191 http://adsabs.harvard.edu http://adsabs.harvard.edu/full/1994IAUS..161..611A An automatic approach for selecting new Hα emission-line galaxies