期刊
ASTRONOMY & ASTROPHYSICS
卷 553, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321430
关键词
globular clusters: individual: NGC 6981; stars: variables: RR Lyrae; instrumentation: high angular resolution; stars: variables: general
资金
- Danish Natural Science Research Council
- European Community [229517, 268421, 274889]
- Center of Excellence Centre for Star and Planet Formation (StarPlan)
- Danish National Research Foundation
- Qatar National Research Fund (QNRF)
- Qatar Foundation [NPRP 09-476-1-078]
- Communaute francaise de Belgique - Actions de recherche concertees Academie universitaire
- Korea Research Council of Fundamental Science & Technology (KRCF) via the KRCF Young Scientist Research Fellowship Programme
- KASI [2013-9-400-00]
- FONDECYT [3120097]
- STFC [ST/I001131/1, ST/J001651/1, ST/J001562/1, ST/H005307/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001131/1, ST/J001562/1, ST/J001651/1, ST/H005307/1] Funding Source: researchfish
- National Research Council of Science & Technology (NST), Republic of Korea [2013971002] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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