2842 20160701171711.0 10.1051/eas/1045062 DOI ASTROimport-999 Blomme, R. 2011 Emission-line Stars and Early-type Stars with Gaia Gaia will provide accurate parallaxes, spectrophotometry and spectroscopy for hundreds of thousands of emission-line stars across the whole HR diagram. In preparation for the Gaia mission, we are developing algorithms to recognize and classify emission-line stars. A large collection of ground-based spectroscopic observations has been collected and will be used for testing and training the algorithms. Gaia will also provide information on several millions of early-type stars. Determining accurate parameters for these stars from Gaia data only will be difficult due to the AV - Teff degeneracy. Frémat, Y. Lobel, A. Martayan, C. EAS Publications Series 45 2011 373-376 http://esoads.eso.org/abs/2011EAS....45..373B published in NONREF