As part of a program to measure abundance ratios in stars beyond 15 kpc from the Galactic center, we have discovered a metal-poor star in the outer halo with a...
A universal method for solar filament detection from Hα observations using semi-supervised deep learning
Filaments are omnipresent features in the solar atmosphere. Their location, properties, and time evolution can provide important information about changes in...
A Variable Mid-infrared Synchrotron Break Associated with the Compact Jet in GX 339-4
Many X-ray binaries remain undetected in the mid-infrared, a regime where emission from their compact jets is likely to dominate. Here, we report the detection...
We report the discovery of a very cool brown dwarf, ULAS J003402.77-005206.7 (ULAS J0034-00), identified in the UKIRT Infrared Deep Sky Survey First Data...
A very dark stellar system lost in Virgo: kinematics and metallicity of SECCO 1 with MUSE
We present the results of VLT-MUSE (Very Large Telescope-Multi Unit Spectroscopic Explorer) integral field spectroscopy of SECCO 1, a faint, star-forming...
A Very Small Array search for the extended Sunyaev-Zel'dovich effect in the Corona Borealis supercluster
We present interferometric imaging at 33 GHz of the Corona Borealis supercluster, using the extended configuration of the Very Small Array. A total area of 24...
A Very-High-Energy Gamma-Ray View of the Transient Sky
The development of the latest generation of Imaging Atmospheric Cherenkov Telescopes (IACTs) over recent decades has led to the discovery of new extreme...
A view of the H-band light-element chemical patterns in globular clusters under the AGB self-enrichment scenario
We discuss the self-enrichment scenario by asymptotic giant branch (AGB) stars for the formation of multiple populations in globular clusters (GCs) by analysing...
A Virtual Observatory Census to Address Dwarfs Origins (AVOCADO). I. Science goals, sample selection, and analysis tools
Context. Even though they are by far the most abundant of all galaxy types, the detailed properties of dwarf galaxies are still only poorly characterised -...