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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693460.0, MPI für Astronomie / Publikationen_mpia
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.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Astronomy and Astrophysics
Start Page:id. A111 ( 4 pp)
Audience:Not Specified
Abstract / Description: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. Based on data collected by MiNDSTEp with the Danish 1.54 m telescope.
Free Keywords:globular clusters: individual: NGC 6981; stars: variables: RR Lyrae; instrumentation: high angular resolution; stars: variables: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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