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The edge-on, nearby spiral galaxy NGC 5907 has long been used as the prototype of a " noninteracting " warped galaxy. We report here the discovery of two interactions with companion dwarf galaxies that substantially change this picture. First, a faint ring structure is discovered around this galaxy that is likely due to the tidal disruption of a companion(More)
We use high-resolution Hubble Space Telescope imaging observations of the young (∼ 15 − 25 Myr) star cluster NGC 1818 in the Large Magellanic Cloud to derive an estimate for the binary fraction of F stars (1.3 < M ⋆ /M ⊙ < 1.6). This study provides the strongest constraints yet on the binary fraction in a young star cluster in a low-metallicity environment(More)
  • Chengyuan Li, Richard de Grijs, Licai Deng
  • 2014
Stars spend most of their lifetimes on the main sequence in the Hertzsprung-Russell diagram. The extended main-sequence turn-off regions--containing stars leaving the main sequence after having spent all of the hydrogen in their cores--found in massive (more than a few tens of thousands of solar masses), intermediate-age (about one to three billion years(More)
Summary form only given. A novel approach named GTRSR (GMM Token Ratio Similarity based Score Regulation) for speaker recognition is presented in this paper, which judge the reliability of a test score based on GMM Token Ratio Similarity. GMM Token which is the index of the UBM component giving the highest score is saved for each frame during the training(More)
Stars in clusters are thought to form in a single burst from a common progenitor cloud of molecular gas. However, massive, old 'globular' clusters--those with ages greater than ten billion years and masses several hundred thousand times that of the Sun--often harbour multiple stellar populations, indicating that more than one star-forming event occurred(More)
We use near-infrared observations obtained as part of the Visible and Infrared Survey Telescope for Astronomy (VISTA) Survey of the Magellanic Clouds (VMC), as well as two complementary Hubble Space Telescope (HST) data sets, to study the luminosity and mass functions as a function of clustercentric radius of the main-sequence stars in the Galactic globular(More)
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