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EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981

Skottfelt, Jesper; Bramich, D. M.; Figuera Jaimes, R.; Jørgensen, U. G.; Kains, N.; W Harpsøe, K. B.; 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, Colin; Street, R. A.; Surdej, J.; Tregloan-Reed, J.; Vilela, C. and Williams, A. (2013). EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981. Astronomy & Astrophysics, 553, article no. A111.

DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201321430
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Abstract

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.

Item Type: Journal Item
Copyright Holders: 2013 ESO
ISSN: 1432-0746
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetGrant NPRP 09-476-1-078Qatar National Research Fund (QNRF), member of Qatar Foundation
Seventh Framework Programme (FP7/2007−2013/)Grant agreement Nos. 229517, 268421 and 274889EU
Center of Excellence Centre for Star and Planet Formation (StarPlan)Not SetThe Danish National Research Foundation
Keywords: globular clusters: individual: NGC 6981; stars: variables: RR Lyrae; instrumentation: high angular resolution; stars: variables: general
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Space
Item ID: 43049
Depositing User: Colin Snodgrass
Date Deposited: 21 May 2015 15:40
Last Modified: 07 Dec 2018 10:31
URI: http://oro.open.ac.uk/id/eprint/43049
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