A1 Refereed original research article in a scientific journal
EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981
Authors: Skottfelt J, Bramich D M, Figuera Jaimes R, Jørgensen U G, Kains N, Harpsøe K B W, Liebig C, Penny M T, Alsubai K A, Andersen J M, Bozza V, Browne P, Calchi Novati S, Damerdji Y, Diehl C, Dominik M, Elyiv A, Giannini E, Hessman F, Hinse T C, Hundertmark M, Juncher D, Kerins E, Korhonen H, Mancini L, Martin R, Rabus M, Rahvar S, Scarpetta G, Southworth J, Snodgrass C, Street R A, Surdej J, Tregloan-Reed J, Vilela C, Williams A
Publisher: EDP Sciences
Publication year: 2013
Journal: Astronomy and Astrophysics
Journal acronym: A&A
Article number: A111
Volume: 553
Number of pages: 4
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/201321430
Web address : http://dx.doi.org/10.1051/0004-6361/201321430
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 variableswere 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.
