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Showing 1 to 20 of 34 for “"star clusters"”.
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Dust in Globular Star Clusters
Made available in DSpace on 2014-12-14T14:37:23Z (GMT). No. of bitstreams: 1 7804041.pdf: 6392277 bytes, checksum: 59a48988b749e41693b5f8d13a13ad89 (MD5) Previous issue date: 1977
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Made-to-measure Modelling of Nuclear Star Clusters
The nuclear star clusters of late-type spiral galaxies are comprised of multiple components. Gemini near-infrared spectroscopy of the nuclear star cluster in NGC 4244 shows clear rotation. Earlier, De Lorenzi et al. (2013) constructed two component (disc + spheroid) axisymmetric three integral …
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Numerical Simulations on the Formation of Massive Star Clusters
Die Entstehung von massereichen gebundenen Sternhaufen in Molekülwolken ist ein Wettrennen zwischen effizienter Sternentstehung und energetischen Rückkopplungsprozessen massereicher Sterne. Diese unterbinden den Sternentstehungsprozeß und treiben das Restgas aus dem System. Der Einfluß des …
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An X-ray census of the youngest galactic star clusters
Stellar clusters are vitally important laboratories for astrophysical research. These clusters, some of which have populations numbering in the hundreds of thousands, comprise a coeval stellar population of similar chemical composition at the same distance, the analysis of which can confront …
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The accuracy of integrated star clusters parameters. The effects of stochasticity /
Star clusters are important tools to probe the star formation history in their host galaxy. The physical parameters (age, mass, extinction, and metallicity) of star clusters with integrated broad-band photometry are traditionally derived using the Simple Stellar Population models (SSP). However, …
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Star clusters near and far. The puzzles of their chemical compositions
Contains fulltext : 302737.pdf (Publisher’s version ) (Open Access)
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A self contamination model for the formation of globular star clusters
… the cluster by an earlier generation of massive stars. It is first shown that such self-contamination naturally produces an [Fe/H] in the range from -2.5 to -1.0, precisely the same range observed in the metal poor (halo) globular clusters; this also seems to require that the disk clusters …
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A self-contamination model for the formation of globular star clusters
… the cluster by an earlier generation of massive stars. It is first shown that such self-contamination naturally produces an (Fe/H) in the range from $-$2.5 to $-$1.0, precisely the same range observed in the metal poor (halo) globular clusters; this also seems to require that the disk clusters …
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Equipartition and mass segregation : simulations of star clusters with two mass-components
… is to check the various theories on early star formation and dynamical evolution. We find significant deviations of the evolutionary time scale in the regime \mu -> 1. Equipartition slows down the gravothermal contraction of the core slightly. Beyond a critical value of \mu ~ 2, no …
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The Connection Between X-Ray Binaries and Star Clusters in the Andromeda Galaxy
… binaries (XRBs) and their relationship with star clusters is an important aspect of astrophysics, offering insights into the processes that govern stellar evolution and the dynamical interactions within star clusters. XRBs are fascinating astronomical systems where a star orbits around a …
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Star Clusters and Dark Matter as Probes of the Spacetime Geometry of Massive Black Holes
… future observations of a hypothetical class of stars orbiting very close to the supermassive black hole at the center of our galaxy, known as Sgr A*, could provide tests of the so-called no-hair theorem of general relativity through the measurement of precessions of their orbital planes. By …
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Formation of young massive star clusters: a high-resolution multi-wavelength study of intensely star-formation galaxies
Super star clusters (SSCs) represent the youngest and most massive form of known gravitationally bound star clusters in the Universe. They are born abundantly in environments that trigger strong and violent star formation (SF) such as in galaxy mergers and interacting systems. SSCs are thus used as …
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Integralinių žvaigždžių spiečių parametrų tikslumas. Stochastiniai efektai /
Star clusters are important tools to probe the star formation history in their host galaxy. The physical parameters (age, mass, extinction, and metallicity) of star clusters with integrated broad-band photometry are traditionally derived using the Simple Stellar Population models (SSP). However, …
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Search for Ultra-faint Milky Way Satellites
… companions i.e. dwarf spheroidal galaxies and star clusters from the Sloan Digital Sky Survey, Dark Energy Survey, and the Stromlo Milky Way Satellite survey project: PegasusIII, Horologium II, and Kim 1–3. Pegasus III is an ultra-faint outer halo dwarf satellite in the constellation of …
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Search for Ultra-faint Milky Way Satellites
… companions i.e. dwarf spheroidal galaxies and star clusters from the Sloan Digital Sky Survey, Dark Energy Survey, and the Stromlo Milky Way Satellite survey project: PegasusIII, Horologium II, and Kim 1–3. Pegasus III is an ultra-faint outer halo dwarf satellite in the constellation of …
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Star Cluster Formation Efficiency in the Andromeda Galaxy
This work revolutionizes the study of star clusters in the Local Group galaxy Andromeda (Messier 31) using high spatial resolution, multi-wavelength imaging from the Hubble Space Telescope obtained as part of the Panchromatic Hubble Andromeda Treasury (PHAT) survey. I construct a cluster catalog …
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Numerical Simulations of Galaxy Formation During the Epoch of Reionization
… runaway stellar collisions in dense primordial star clusters form a very massive star that is likely to collapse to an intermediate mass black hole (IMBH) with $M_{\rm BH}>10^3$M$_{\odot}$. In order to test this scenario, I added 12 species non-equilibrium chemistry to the massively parallel …
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