The striking broad emission line spectroscopic appearance of Wolf-Rayet (WR) stars has
long defied analysis, owing to the extreme physical conditions within their line-and …

Context. Optical long-baseline interferometry is moving a crucial step forward with the
advent of general-user scientific instruments that equip large aperture and hectometric …

While interference fringes contain both amplitude and phase information, most
interferometric results published to date focus solely on the amplitude data. This is because …

ABSTRACT We present new Spitzer Space Telescope observations of stars in the young (∼
5 Myr) γ Velorum stellar cluster. Combining optical and 2MASS photometry, we have …

Context. A key science goal of the Gaia-ESO survey (GES) at the VLT is to use the
kinematics of low-mass stars in young clusters and star forming regions to probe their …

Massive systems made of two or more stars are known to be the site for interesting physical
processes–including at least in some cases–particle acceleration. Over the past decade, this …

Context. This is the second paper of a series on Galactic OB groups that uses astrometric
and photometric data from Gaia and spectral classifications from the Galactic O-Star …

Context. Among optical stellar interferometers, the CHARA Array located at Mt Wilson in
California offers the potential of very long baselines (up to 330 m) and the prospect of …

With its unprecedented light-collecting area for night-sky observations, the Cherenkov
Telescope Array (CTA) holds great potential for also optical stellar astronomy, in particular …

We outline the science opportunities in the areas of searches for dark matter and new
physics offered by a proposed future MeV gamma-ray telescope, the Galactic Explorer with a …