Context. We present the early installment of the third Gaia data release, Gaia EDR3,
consisting of astrometry and photometry for 1.8 billion sources brighter than magnitude 21 …

Contact binaries consist of two strongly interacting component stars where they are filling
their critical Roche lobes and sharing a common envelope. Most of them are main-sequence …

Context. Gaia DR3 contains 1.8 billion sources with G-band photometry, 1.5 billion of which
with G BP and G RP photometry, complemented by positions on the sky, parallax, and …

Abstract The Lomb–Scargle periodogram is a well-known algorithm for detecting and
characterizing periodic signals in unevenly sampled data. This paper presents a conceptual …

Context. RR Lyrae stars are excellent tracers of the oldest stars (ages≳ 9–10 Gyr) and
standard candles for measuring the distance to stellar systems that are mainly composed of …

Abstract The All-Sky Automated Survey for Supernovae (ASAS-SN) is the first optical survey
to routinely monitor the whole sky with a cadence of∼ 2–3 d down to V≲ 17 mag. ASAS-SN …

Abstract We introduce the Automatic Learning for the Rapid Classification of Events
(ALeRCE) broker, an astronomical alert broker designed to provide a rapid and self …

Abstract The Asteroid Terrestrial-impact Last Alert System (ATLAS) carries out its primary
planetary defense mission by surveying about 13,000 deg 2 at least four times per night. The …

The variable stars in the VSX catalogue are derived from a multitude of inhomogeneous
data sources and classification tools. This inhomogeneity complicates our understanding of …

Context. Cepheids are pulsating stars that play a crucial role in several astrophysical
contexts. Among the different types, the Classical Cepheids are fundamental tools for the …