期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 442, 期 3, 页码 2381-2391出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu930
关键词
techniques: photometric; binaries: general; stars: variables: general; globular clusters: individual: NGC 6121
资金
- PRIN-INAF
- STScI [GO-12911]
- Villum Foundation
- Australian Research Council [DP120100475]
- National Science Centre [DEC-2012/07/B/ST9/04412]
- INAF-OAPd [19/2013, 42/2013]
- European Union [313014]
- CARIPARO foundation
We present the results of a photometric search for variable stars in the core of the Galactic globular cluster Messier 4 (M 4). The input data are a large and unprecedented set of deep Hubble Space Telescope WFC3 images (large programme GO-12911; 120 orbits allocated), primarily aimed at probing binaries with massive companions by detecting their astrometric wobbles. Though these data were not optimized to carry out a time-resolved photometric survey, their exquisite precision, spatial resolution and dynamic range enabled us to firmly detect 38 variable stars, of which 20 were previously unpublished. They include 19 cluster-member eclipsing binaries (confirming the large binary fraction of M 4), RR Lyrae and objects with known X-ray counterparts. We improved and revised the parameters of some among published variables.
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