EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981
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Two previously unknown variable stars in the crowded central region of the globular cluster NGC 6981 are presented. The observations were made using the electron multiplying CCD (EMCCD) camera at the Danish 1.54 m Telescope at La Silla, Chile. The two variables were not previously detected by conventional CCD imaging because of their proximity to a bright star. This discovery demonstrates that EMCCDs are a powerful tool for performing high-precision time-series photometry in crowded fields and near bright stars, especially when combined with difference image analysis.
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Kains, N.; Bramich, D.; Arellano Ferro, A.; Figuera Jaimes, R.; Jørgensen, U.; Giridhar, S.; Penny, M.; Alsubai, K.; Andersen, J.; Bozza, V.; Browne, P.; Burgdorf, M.; Calchi Novati, S.; Damerdji, Y.; Diehl, C.; Dodds, P.; Dominik, M.; Elyiv, A.; Fang, X.; Giannini, E.; Gu, S.; Hardis, S.; Harpsoe, K.; Hinse, T.; Hornstrup, A.; Hundertmark, M.; Jessen-Hansen, J.; Juncher, D.; Kerins, E.; Kjeldsen, H.; Korhonen, H.; Liebig, C.; Lund, M.; Lundkvist, M.; Mancini, L.; Martin, R.; Mathiasen, M.; Rabus, M.; Rahvar, S.; Ricci, D.; Sahu, K.; Scarpetta, G.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; Surdej, J.; Tregloan-Reed, J.; Vilela, C.; Wertz, O.; Williams, Andrew (2013)Aims. We present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M30 (NGC 7099). Weused our data to search for variable stars in this cluster and refine the periods ...
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