6/19/2023 0 Comments Hst astrometryIn this paper, we present the analysis of our photometric and astrometric measurements for 6 of these events, and derive mass constraints for the lens in each of these. The stars we monitored include several bright microlensing events observed from the ground by the OGLE collaboration. In addition to this, we monitored the same pointings using the VIMOS imager on the Very Large Telescope. We used the Hubble Space Telescope to monitor stars near the Galactic Center for 3 years, and we measured the brightness and positions of ∼2 million stars at each observing epoch. We report on the first results from a large-scale observing campaign aiming to use astrometric microlensing to detect and place limits on the mass of single objects, including stellar remnants. MZ acknowledges support by the Ministry of Economy, Development, and Tourism’s Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics (MAS), by Fondecyt Regular 1150345 and by the BASAL-CATA Center for Astrophysics and Associated Technologies PFB-06. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to AU. Kains, N, Calamida, A, Sahu, K C, Casertano, S, Anderson, J, Udalski, A, Zoccali, M, Bond, H, Albrow, M, Bond, I, Brown, T, Dominik, M, Fryer, C, Livio, M, Mao, S & Rejkuba, M 2017, ' Microlensing constraints on the mass of single stars from HST astrometric measurements ', Astrophysical Journal, vol.
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