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.
Skottfelt , J , Bramich , D M , Figuera Jaimes , R J , Jorgensen , U G , Kains , N , Harpsoe , 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 2013 , ' EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981 ' Astronomy & Astrophysics , vol 553 , A111 . DOI: 10.1051/0004-6361/201321430
Astronomy & Astrophysics
Reproduced with permission from Astronomy & Astrophysics, © 2013 ESO
J.S. acknowledges support from the ESO 2012 DGDF for a two month visit to ESO Garching. The operation of the Danish 1.54 m telescope is financed by a grant to UGJ from the Danish Natural Science Research Council. We also acknowledge support from the European Community’s Seventh Framework Programme (FP7/2007−2013/) under grant agreement Nos. 229517, 268421 and 274889 and from the Center of Excellence Centre for Star and Planet Formation (StarPlan) funded by The Danish National Research Foundation. K.A.A., M.D., D.M.B., C.L., M.H., R.A.S. and C.S. are thankful to Qatar National Research Fund (QNRF), member of Qatar Foundation, for support by grant NPRP 09-476-1-078. Y.D., A.E. under J.S. acknowledge support from the Communauté française de Belgique – Actions de recherche concertées – Académie universitaire to Wallonie-Europe. TCH acknowledges support from the Korea Research Council of Fundamental Science & Technology (KRCF) via the KRCF Young Scientist Research Fellowship Programme and for financial support from KASI travel grant number 2013-9-400-00. M.R. acknowledges support from FONDECYT postdoctoral fellowship No. 3120097.
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