The 2011 Periastron Passage of the Be Binary δ Scorpii
We describe the results of the world-wide observing campaign of the highly eccentric Be binary system δ Scorpii 2011 periastron passage which involved...
The 2023 Outburst of the Gaia Alerted EXor Gaia23bab
Episodic accretion is a fundamental process in the build-up of the stellar mass. EX Lupi-type eruptive young stars (EXors) represent one of the main types of...
The 2024 May event in the context of auroral activity over the past 375 yr
We survey 223 916 auroral records from the Northern hemisphere observed between 1650 January and 2024 July, making full allowance for the secular change in the...
The 3D kinematics of stellar substructures in the periphery of the Large Magellanic Cloud
We report the 3D kinematics of 27 Mira-like stars in the northern, eastern, and southern periphery of the Large Magellanic Cloud (LMC), based on Gaia proper...
Fast radio burst FRB 20180916B in its host galaxy SDSS J015800.28+654253.0 at 149 Mpc is by far the closest-known FRB with a robust host galaxy association. The...
Historically, 3C 66A has been considered a relative quiescent blazar. For that reason, 3C 66A was selected as a comparison source for OJ 287 in the OJ-94...
The 67P/Churyumov-Gerasimenko observation campaign in support of the Rosetta mission
We present a summary of the campaign of remote observations that supported the European Space Agency's Rosetta mission. Telescopes across the globe (and in...
The 6Li/7Li isotopic ratio in the metal-poor binary CS22876-032
Aims: We present high-resolution and high-quality UVES spectroscopic data of the metal-poor double-lined spectroscopic binary CS 22876-032 ([Fe/H] approximately...
The 700 ks Chandra Spiderweb Field. I. Evidence for widespread nuclear activity in the protocluster
Aims: We present an analysis of the 700 ks Chandra ACIS-S observation of the field around the radio galaxy J1140-2629 (the Spiderweb Galaxy) at z = 2.156...