Our spectral diagnostic based on the intensity of the [OI]λ6300Å line indicates that many observed HII regions are indeed density-bounded. The estimated...

A spectrophotometric study of the peculiar open cluster Berkeley 87 is presented; the measurements show that most of the members are young, heavily reddened OB...

We consider the Orion Nebula (M 42) within a project aimed at studying the interaction between massive stars and their surrounding ISM. This is an HII region...

The spectroscopic observations were conducted during several runs spanning 15 years from March 1988 to June 2003. The observations from the Southern Hemisphere...

The ESA cornerstone mission Gaia will revolutionise astronomy observing objects as diverse as minor planets, stars,and galaxies out to QSOs. We estimate that...

The reddened open cluster NGC7419 is believed to have a very high fraction of Be stars and present an exceptionally high number of red supergiants (five for no...

We present the radial profiles of the age, metallicity and alpha /Fe enhancement of the stellar populations in the bulge-dominated region for a sample of eight...

Exoplanet population studies indicate that small rocky planets may be common around very low-mass stars and brown dwarfs: "ultra-cool" dwarfs. Temperate rocky...

Not Available