523 datasets found

The ages of young star clusters are fundamental clocks to constrain the formation and evolution of pre-main-sequence stars and their protoplanetary disks and exoplanets....

Massive black holes (MBHs) are typically hosted in the centres of massive galaxies but they appear to become rarer in lower mass galaxies, where nuclear star clusters (NSCs)...

W40 is a heavily obscured bipolar HII region projected in the direction of the Aquila Rift and ionized by hot stars in a central, partly embedded cluster. The study of the...

We have mapped the G287.84-0.82 cometary globule (with the Treasure Chest cluster embedded in it) in the South Pillars region of Carina (i) in [CII], 63um [OI] , and CO(11-10)...

We study the three dimensional arrangement of young stars in the solar neighbourhood using the second release of the Gaia mission (Gaia DR2) and we provide a new, original view...

The Cygnus complex is one of the most powerful star forming regions at a close distance from the Sun (~1.4kpc). Its richest OB association Cygnus OB2 is known to harbor many...

The purpose of this work is to understand the global characteristics of the stellar populations in NGC 300. In particular, we focused our attention on searching young star...

Surface differential rotation (SDR) plays a key role in dynamo models and determines a lower limit on the accuracy of stellar rotation period measurements. SDR estimates are...

We present the results of a proper motion study aiming at providing further evidence on the origin of the proposed stellar members of the Chamaeleon I and II clouds and to...

The physical properties of almost any kind of astronomical object can be derived by fitting synthetic spectra or photometry extracted from theoretical models to observational...

In this paper we discuss the cluster and field star formation in the central part of the Small Magellanic Cloud. The main goal is to study the correlation between young objects...

A new identification of OB associations in M 31 has been performed using the Path Linkage Criterion technique of Battinelli (1991A&A...244...69B). We found 174 associations...

The catalog is a compilation of the observed projected rotational velocities, V_rot_sin(i), for 28179 stars from 166 open clusters, globular clusters and associations. The...

The catalog is a selection of data on all open clusters extracted from the second, considerably enlarged edition of the "Catalogue of Star Clusters and Associations" edited by...

A new catalogue of clusters in the Large Magellanic Cloud has been constructed from searches of the IIIa-J component of the ESO/SERC Southern Sky Atlas. The catalogue contains...

A new partition into associations of OB stars within 3kpc of the Sun is derived using Battinelli's modification of the cluster analysis method. We have found 58 associations, of...

OB associations are unbound groups of young stars made prominent by their bright OB members, and have long been thought to be the expanded remnants of dense star clusters. They...

Two cluster analysis algorithms - the principal stars method and the hierarchical clustering method - are used to identify moving star clusters in a sample of 1947 single and...

The Cygnus OB2 association is the largest concentration of young and massive stars within 2kpc of the Sun, including an estimated 65 O-type stars and hundreds of OB stars. The...

Using the highest-resolution X-ray observation of the Trumpler 15 star cluster taken by the Chandra X-ray Observatory, we estimate the total size of its stellar population by...