Results 1 to 10 of about 571,460 (340)

Chemical evolution of star clusters [PDF]

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2010
I discuss the chemical evolution of star clusters, with emphasis on old Galactic globular clusters (GCs), in relation to their formation histories. GCs are clearly formed in a complex fashion, under markedly different conditions from any younger clusters presently known. Those special conditions must be linked to the early formation epoch of the Galaxy
van Loon, Jacco Th.
openaire   +4 more sources

Dependency of dynamical ejections of O stars on the masses of very young star clusters [PDF]

, 2015
Massive stars can be efficiently ejected from their birth clusters through encounters with other massive stars. We study how the dynamical ejection fraction of O star systems varies with the masses of very young star clusters, Mecl, by means of direct N -body calculations.
arxiv   +1 more source

Be stars in young clusters

The Astrophysical Journal, 1994
Photometric Ha and HP line indices for 71 B stars in seven galactic clusters are presented. Some stars in three of the clusters were observed at two epochs. Using these data nine Be stars were identified. Three of them were previously detected as emission-line stars, while six do not appear to have been previously recognized as such.
Goderya, Shaukat N., Schmidt, Edward G.
openaire   +2 more sources

The alignment is in their stars: on the spin-alignment of stars in star clusters [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2018
ABSTRACT We simulate star formation in two molecular clouds extracted from a larger disc-galaxy simulation with a spatial resolution of ∼0.1 pc, one exiting a spiral arm dominated by compression, and another in an inter-arm region more strongly affected by galactic shear.
Rey-Raposo, Ramon, Read, Justin I
openaire   +5 more sources

Massive Star Cluster Formation with Binaries. I. Evolution of Binary Populations

The Astrophysical Journal
We study the evolution of populations of binary stars within massive cluster-forming regions. We simulate the formation of young massive star clusters within giant molecular clouds with masses ranging from 2 × 10 ^4 to 3.2 × 10 ^5 M _⊙ .
Claude Cournoyer-Cloutier, Alison Sills, William E. Harris, Brooke Polak, Steven Rieder, Eric P. Andersson, Sabrina M. Appel, Mordecai-Mark Mac Low, Stephen McMillan, Simon Portegies Zwart   +9 more
doaj   +1 more source

Young and intermediate-age massive star clusters

, 2009
An overview of our current understanding of the formation and evolution of star clusters is given, with main emphasis on high-mass clusters. Clusters form deeply embedded within dense clouds of molecular gas. Left-over gas is cleared within a few million
Girardi L., Larsen S. S., Larsen S. S., Meylan G., Shapley H., Shapley H., Spitzer L., Whitmore B. C., Wielen R., Williams J. P.   +9 more
core   +1 more source

VLA 22 GHz Imaging of Massive Star Formation in Local Wolf–Rayet Galaxies

The Astrophysical Journal
We present 22 GHz imaging of regions of massive star formation within the Local Wolf–Rayet Galaxy Sample, a NSF Karl G. Jansky Very Large Array survey of 30 local galaxies showing spectral features of Wolf–Rayet (WR) stars.
Nicholas G. Ferraro, Jean L. Turner, Sara C. Beck, Edwin Alexani, Runa Indrei, Bethany M. Welch, Tunhui Xie   +6 more
doaj   +1 more source

Clustered Star Formation: A Review [PDF]

, 2012
In this contribution I present a review of star formation in clusters. I begin by discussing the various definitions of what constitutes a star cluster, and then compare the outcome of star formation (IMF, multiplicity, mass segregation and structure and morphology) in different star-forming regions.
arxiv   +1 more source

The Star Clusters as Links between Galaxy Evolution and Star Formation Project. I. Numerical Method

The Astrophysical Journal
Stellar clusters are critical constituents within galaxies: They are the result of highest-density star formation, and through their spatially and temporally correlated feedback, they regulate their host galaxy evolution.
Marta Reina-Campos, Oleg Y. Gnedin, Alison Sills, Hui Li   +3 more
doaj   +1 more source

The Promiscuous Nature of Stars in Clusters

The Astrophysical Journal, 2002
The recent availability of special-purpose computers designed for calculating gravitational interactions of N bodies at extremely high speed has provided the means to model globular clusters on a star-by-star basis for the first time. By endeavoring to make the N-body codes that operate on these machines as realistic as possible, the addition of ...
Hurley, Jarrod R., Shara, Michael M.
openaire   +5 more sources