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Substructure revealed by RR Lyraes in SDSS Stripe 82
We present an analysis of the substructure revealed by RR Lyraes in Sloan Digital Sky Survey Stripe 82, which covers 2°5 in declination on the celestial equator over the right ascension range α = 20…
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V1309 Scorpii: merger of a contact binary
Context. Stellar mergers are expected to take place in numerous circumstences in the evolution of stellar systems. In particular, they are considered as a plausible origin of stellar eruptions of the…
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Gaia Data Release 2
Context. Gaia Data Release 2 provides high-precision astrometry and three-band photometry for about 1.3 billion sources over the full sky. The precision, accuracy, and homogeneity of both astrometry…
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WR 20a Is an Eclipsing Binary: Accurate Determination of Parameters for an Extremely Massive Wolf-Rayet System
We present a high-precision I-band light curve for the Wolf-Rayet binary WR 20a, obtained as a subproject of the Optical Gravitational Lensing Experiment. Rauw et al. have recently presented…
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OGLE 2003-BLG-235/MOA 2003-BLG-53: A Planetary Microlensing Event
We present observations of the unusual microlensing event OGLE 2003-BLG-235/MOA 2003-BLG-53. In this event, a short-duration (~7 days) low-amplitude deviation in the light curve due to a single-lens…
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The Cosmic Horseshoe: Discovery of an Einstein Ring around a Giant Luminous Red Galaxy
We report the discovery of an almost complete (~300°) Einstein ring of diameter 10′′ in Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5). Spectroscopic data from the 6 m telescope of the Special…
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Light and motion in SDSS Stripe 82: The catalogues
We present a new public archive of light-motion curves in Sloan Digital Sky Survey (SDSS) Stripe 82, covering 99° in right ascension from a = 20 h 7 to 3 h .3 and spanning 2.°52 in declination from δ…
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Gaia Early Data Release 3
Context. Gaia Early Data Release 3 (Gaia EDR3) provides accurate astrometry for about 1.6 million compact (QSO-like) extragalactic sources, 1.2 million of which have the best-quality five-parameter…
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Over 38000 RR Lyrae Stars in the OGLE Galactic Bulge Fields
We present the most comprehensive picture ever obtained of the central parts of the Milky Way probed with RR Lyrae variable stars. This is a collection of 38257 RR Lyr stars detected over 182 square…
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The OGLE view of microlensing towards the Magellanic Clouds – III. Ruling out subsolar MACHOs with the OGLE‐III LMC data★
In the third part of the series presenting the Optical Gravitational Lensing Experiment (OGLE) microlensing studies of the dark matter halo compact objects (MACHOs), we describe results of the…
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