Four XMM-Newton observations of the core of M 31, spaced at 6 month intervals, show that the brightest point X-ray source, RX J0042.6+4115, has a 0.4–10 keV luminosity of ∼5× 1038 erg s−1, and exhibits significant variability in intensity and X-ray spectrum over a time scale of ∼100 s including hard flares; such behaviour is only observed in Z-sources and transient black hole binaries in our Ga...

Direct numerical simulations of chevrons, blinking states, and repeated transients in binary fluid mixtures with a negative separation ratio heated from below are described. The calculations are performed in two-dimensional containers using realistic boundary conditions and the parameter values used in the experiments of Kolodner [Phys. Rev. E 47, 1038 (1993)]. Particular attention is paid to t...

Abstract We report the analysis of microlensing event OGLE-2017-BLG-1038, observed by Optical Gravitational Lensing Experiment, Korean Microlensing Telescope Network, and Spitzer telescopes. The is caused a giant source star in Galactic Bulge passing over large resonant binary-lens caustic. availability space-based data allows full set physical parameters to be calculated. However, there exists...

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