We study the initial mass function (IMF) of one of the most massive Galactic star-forming
regions NGC 3603 to answer a fundamental question in current astrophysics: is the IMF …

In the star-formation process, the vital impact of environmental factors such as feedback from
massive stars and stellar density on the form of the initial mass function (IMF) at the low …

We present a uniform analysis of the stellar initial mass function (IMF) from integrated light
spectroscopy of 15 compact stellar systems (11 globular clusters in M31 and 4 ultra compact …

Context. The spectral classifications of the Galactic O-Star Spectroscopic Survey (GOSSS)
and the astrometric and photometric data from Gaia have significantly improved our ability to …

Abstract Based on deep Very Large Telescope Infrared Spectrometer and Array Camera
JHK photometry, we have derived the present-day mass function (MF) of the central starburst …

We present UBVRI and H α photometry of the extremely compact, starburst cluster NGC
3603. Ground-based images, Hubble Space Telescope (HST) archival data, as well as …

Aims. In the framework of a project aiming at homogeneously deriving the properties (age,
distance, reddening, and detailed chemical abundances) of a large sample of old open …

We analyse the optical spectrum of the very massive binary system WR 20a (WN6ha+
WN6ha). The most prominent emission lines, Hα and He ii λ 4686, display strong phase …

We investigate the massive star content of NGC 3603, the closest known giant H ii region.
We have obtained spectra of 26 stars in the central cluster using the Baade 6.5 m telescope …

We investigate the uncertainties in the synthetic integrated colors of simple stellar
populations, currently the most popular method of estimating the ages of unresolved stellar …