The M4 Core Project with HST --- I. Overview and First-Epoch

1); (10) Univ. of Amsterdam; 11); (11) Harvard-Smithsonian CfA; (12) Sam Houston State Univ.; 13); (13) Eureka Scientific; (14) Aarhus Univ.; 15); (15) Univ. of Victoria)

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The M4 Core Project with HST --- I. Overview and First-Epoch

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arxiv 1312.1096 v1 pith:YI5VV53Q submitted 2013-12-04 astro-ph.GA

L. R. Bedin (1) J. Anderson (2) , D. C. Heggie (3) , G. Piotto (4 , 1) , A. P. Milone (5 , 6 , 7) , M. Giersz (8)

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V. Nascimbeni (4 A. Bellini (2) R. M. Rich (9) M. van den Berg (10 11) D. Pooley (12 13) K. Brogaard (14 15) S. Ortolani (4 L. Malavolta (4 L. Ubeda (2) A. F. Marino (7). ((1) INAF-OAPD (2) STScI (3) Univ. of Edinburg (4) Univ. of Padova (5) IAC (6) Univ. of La Laguna (7) RSAA-ANU (8) N. Copernicus AC Warsaw (9) UCLA (10) Univ. of Amsterdam (11) Harvard-Smithsonian CfA (12) Sam Houston State Univ. (13) Eureka Scientific Inc. (14) Aarhus Univ. (15) Univ. of Victoria)

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We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M4, the nearest Galactic globular cluster, and the observations are designed to constrain the number of binaries with massive companions (black holes, neutron stars, or white dwarfs) by measuring the ``wobble'' of the luminous (main-sequence) companion around the center of mass of the pair, with an astrometric precision of ~50 micro-arcseconds. The high spatial resolution and stable medium-band PSFs of WFC3/UVIS will make these measurements possible. In this work we describe: (i) the motivation behind this study, (ii) our observing strategy, (iii) the many other investigations enabled by this unique data set, and which of those our team is conducting, and (iv) a preliminary reduction of the first-epoch data-set collected on October 10, 2012.

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