Context. The Gaia-ESO Survey (GES) is a public, high-resolution spectroscopic survey,
conducted with the multi-object spectrograph Fibre Large Array Multi Element Spectrograph …

Be stars are a class of rapidly rotating B stars with circumstellar disks that cause Balmer and
other line emission. There are three possible reasons for the rapid rotation of Be stars: they …

Aims. Following the advent of increasingly sensitive X-ray observatories, deep observations
of early-type stars became possible. However, the results for only a few objects or clusters …

We revisit the problem of the star formation timescale and the ages of molecular clouds. The
apparent overabundance of star-forming molecular clouds over clouds without active star …

The origin of young star clusters represents a major challenge for modern stellar
astrophysics. While stellar rotation partially explains the colour spread observed along main …

Context. The Carina Nebula complex (CNC) is one of the most massive and active star-
forming regions in our Galaxy and it contains several large young star clusters. The …

We reexamine critically the estimates of the duration of different phases of star formation and
the lifetimes of molecular clouds based on the ages of T Tauri stars, age spreads of stars in …

An analysis is presented of VLT-FLAMES spectroscopy for three Galactic clusters, NGC
3293, NGC 4755 and NGC 6611. Non-LTE model atmosphere calculations have been used …

We present a study of the recent star formation (SF) of 30 Doradus in the Large Magellanic
Cloud (LMC) using the panchromatic imaging survey Hubble Tarantula Treasury Project. In …

Based on an analysis of data obtained with the Wide Field Camera 3 on the Hubble Space
Telescope we report the identification of two distinct stellar populations in the core of the …