ABSTRACT FU Orionis objects (FUors) are eruptive young stars, which exhibit outbursts that
last from decades to a century. Due to the duration of their outbursts, and to the fact that only …

Context. EX Lupi is the prototype by which EXor-type outbursts have been defined. It has
experienced multiple accretion-related bursts and outbursts throughout the past decades …

Gaia19fct is one of the Gaia-alerted eruptive young stars that has undergone several
brightening events. We conducted monitoring observations using multifilter optical and near …

ABSTRACT Mid-infrared (mid-IR) variability in young stellar objects (YSOs) is driven by
several physical mechanisms, which produce a variety of amplitudes and light-curve …

Gaia21bty, a pre-main-sequence star that previously had shown aperiodic dips in its light
curve, underwent a considerable Δ G≈ 2.9 mag brightening that occurred over a few …

We present the design and performance of the TANSPEC, a medium-resolution 0.55–2.5 μm
cryogenic spectrometer and imager, now in operation at the 3.6 m Devasthal Optical …

Abstract On 2023 March 6, the Gaia telescope alerted a 2 mag burst from Gaia23bab, a
young stellar object in the Galactic plane. We observed Gaia23bab with the Large Binocular …

Context. Gaia18cjb is one of the Gaia-alerted eruptive young star candidates that has been
experiencing a slow and strong brightening during the last 13 years, similarly to some FU …

Actively accreting young stellar objects show H α emission line in their spectra. We present
the results of survey for H α emission-line stars in the star-forming region IC 5070 taken with …

We present here the results of 8 yr of our near-simultaneous optical–near-infrared spectro-
photometric monitoring of the bona fide FU Ori (FUor)-type candidate V2493 Cygnus (V2493 …