Several recent studies have shown that the Vela OB2 region hosts a complex constellation of sub-populations with ages in the range 10 to 50 Myr. Such populations might represent the best example of the outcome of clustered star formation in giant molecular clouds (GMCs). We use Gaia DR2 data over an area of 40 deg radius around the open cluster

During their soft state edge-on black hole transients show blue-shifted absorption lines in their X-ray spectra due to hot and equatorial disk winds. Blue-shifted absorption lines have also been discovered in optical and ultraviolet(UV). These features must be produced in an outflow, but the physical conditions required to form them are very

The WEAVE-Apertif (WA) survey on the William Herschel Telescope will perform dedicated large integral field unit (LIFU; 90") optical spectroscopy follow-up of 400 HI resolved galaxies from the Apertif HI survey. The LIFU observations will provide an unprecedented study of galaxy evolution and dynamics with 3-6x the physical resolution and 2-3x the

Context. The formation of cosmic structures culminates with the assembly of galaxy clusters, a process that is quite different from cluster to cluster. Aims: We present the study of the structure and dynamics of the Lyra complex, consisting of the two clusters RXC J1825.3+3026 and CIZA J1824.1+3029, which was very recently studied by using both X

In this paper we report the current status of a new research program. The primary goal of the “Vanishing and Appearing Sources during a Century of Observations” project is to search for vanishing and appearing sources using existing survey data to find examples of exceptional astrophysical transients. The implications of finding such objects extend

Crater II is the fourth largest galaxy among the satellites of the Milky Way, only surpassed by the Magellanic Clouds, Sagittarius and the recently discovered Antlia II galaxy. This galaxy lies in the frontier between classical satellites and ultra-faint dwarf galaxies. We explore the stellar population of Crater II through both its variable star