Journal ArticleDOI
Are hierarchically formed embedded star clusters surviving gas expulsion depending on their initial conditions
TLDR
In this article, the dissolution process of young embedded star clusters with different primordial mass segregation levels using fractal distributions was investigated by means of N-body simulations, and it was shown that the fraction of bound stellar mass can be well predicted just right after the gas expulsion but tends to be lower at later stages, as these systems evolve due to the stronger two-body interactions resulting from the inclusion of a realistic initial mass function.Abstract:
We investigate the dissolution process of young embedded star clusters with different primordial mass segregation levels using fractal distributions by means of N-body simulations. We combine several star clusters in virial and subvirial global states with Plummer and uniform density profiles to mimic the gas. The star clusters have masses of M-stars = 500 M-circle dot that follow an initial mass function where the stars have maximum distance from the centre of r = 1.5 pc. The clusters are placed in clouds that at the same radius have masses of M-cloud = 2000 M-circle dot, resulting in star formation efficiency of 0.2. We remove the background potential instantaneously at a very early phase, mimicking the most destructive scenario of gas expulsion. The evolution of the fraction of bound stellar mass is followed for a total of 16 Myr for simulations with stellar evolution and without. We compare our results with previous works using equal-mass particles where an analytical physical model was used to estimate the bound mass fraction after gas expulsion. We find that independent of the initial condition, the fraction of bound stellar mass can be well predicted just right after the gas expulsion but tends to be lower at later stages, as these systems evolve due to the stronger two-body interactions resulting from the inclusion of a realistic initial mass function. This discrepancy is independent of the primordial mass segregation level.read more
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Journal ArticleDOI
Low Mass Stars as Tracers of Star and Cluster Formation
TL;DR: The use of young low mass stars and protostars, or young stellar objects (YSOs), as tracers of star formation has been discussed in this paper , with the ability to detect deeply embedded objects at all evolutionary stages.
Journal ArticleDOI
Asymmetrical tidal tails of open star clusters: stars crossing their cluster's prah challenge Newtonian gravitation
Pavel Kroupa,Tereza Jerabkova,Ingo Thies,Jan Pflamm-Altenburg,Benoit Famaey,Henri M. J. Boffin,Joerg Dabringhausen,Giacomo Beccari,T. Prusti,C. M. Boily,Xufen Wu,Jaroslav Haas,Hosein Haghi,Akram Hasani Zonoozi,Guillaume F. Thomas,Ladislav Šubr,Sverre J. Aarseth +16 more
TL;DR: In this article , the Phantom of Ramses code is applied to estimate the number of stars in the leading and trailing tails of a Milgromian open cluster to estimate its orbital eccentricity, showing that the asymmetry reaches the observed values for 50 < ǫ cl /ǫ < 200, being maximal near peri-galacticon, and can slightly invert near apo-Galacticon.
Journal ArticleDOI
The Internal Line-of-Sight Kinematics of NGC 346: The Rotation of the Core Region
TL;DR: In this paper , the stellar radial velocity analysis of the central 1′×1′ of the young massive Small Magellanic Cloud star cluster NGC 346 was performed using VLT/MUSE integral field spectroscopy in combination with Hubble Space Telescope photometry.
References
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Journal ArticleDOI
The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
TL;DR: Combining IMF estimates for different populations in which the stars can be observed individually unveils an extraordinary uniformity of the IMF, which appears to hold for populations including present-day star formation in small molecular clouds.
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On the Stellar Population and Star-Forming History of the Orion Nebula Cluster
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A spitzer survey of young stellar clusters within one kiloparsec of the sun: cluster core extraction and basic structural analysis
Robert A. Gutermuth,Robert A. Gutermuth,S. T. Megeath,Philip C. Myers,Lori E. Allen,Judith L. Pipher,Giovanni G. Fazio +6 more
TL;DR: In this article, a uniform mid-infrared imaging and photometric survey of 36 young, nearby, star-forming clusters and groups using Spitzer IRAC and MIPS is presented.
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A Preliminary Study of the Orion Nebula Cluster Structure and Dynamics
TL;DR: The Orion Nebula Cluster (ONC) as discussed by the authors is a very young cluster that is not circularly symmetric in projection but is elongated north-south in a manner similar to the molecular gas distribution in the region, suggesting that the stellar system may still reflect the geometry of the protocluster cloud.