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Metagenomic-scale analysis of the predicted protein structure universe
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Science, 1984
In their attempt to reach kinetic equilibrium, through gravitational encounters between separate stars, globular clusters are driven to destruction, with their cores collapsing and their outer regions expanding. The effects of core collapse, which apparently produces x-ray sources, are not yet fully understood, but white dwarfs and neutron stars ...
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In their attempt to reach kinetic equilibrium, through gravitational encounters between separate stars, globular clusters are driven to destruction, with their cores collapsing and their outer regions expanding. The effects of core collapse, which apparently produces x-ray sources, are not yet fully understood, but white dwarfs and neutron stars ...
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Publications of the Astronomical Society of Australia, 1975
Current evolutionary theory indicates that evolving stars in globular clusters arrive on the horizontal branch with ~30% less mass than they had on the main sequence. If, as seems likely, this mass loss results from the outflow of unprocessed material at the stellar surface during the giant stage, and if the ejected mass were retained within the ...
D.J. Faulkner, K.C. Freeman
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Current evolutionary theory indicates that evolving stars in globular clusters arrive on the horizontal branch with ~30% less mass than they had on the main sequence. If, as seems likely, this mass loss results from the outflow of unprocessed material at the stellar surface during the giant stage, and if the ejected mass were retained within the ...
D.J. Faulkner, K.C. Freeman
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Publications of the Astronomical Society of the Pacific, 1991
Additional arguments are presented for an earlier claim by Peng and Weisheit (1991) that highly ionized metal-line absorption systems observed in QSO spectra arise in the protoglobular clusters of young galaxies. A schematic view is presented of several protoglobular clusters in a young galaxy, together giving rise to the clustered C IV absorption ...
Wei Peng, Jon C. Weisheit
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Additional arguments are presented for an earlier claim by Peng and Weisheit (1991) that highly ionized metal-line absorption systems observed in QSO spectra arise in the protoglobular clusters of young galaxies. A schematic view is presented of several protoglobular clusters in a young galaxy, together giving rise to the clustered C IV absorption ...
Wei Peng, Jon C. Weisheit
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Publications of the Astronomical Society of Australia, 1967
The globular clusters 47 Tuc (NGC 104) and NGC 6723 both belong to the group of clusters which have late-type integrated spectra and which appear to be only slightly metal deficient with respect to the stars in the Hyades.
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The globular clusters 47 Tuc (NGC 104) and NGC 6723 both belong to the group of clusters which have late-type integrated spectra and which appear to be only slightly metal deficient with respect to the stars in the Hyades.
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1998
Globular clusters are roughly spherical, densely packed groups of stars found around galaxies. Most globular clusters probably formed at the same time as their host galaxies. They therefore provide a unique fossil record of the conditions during the formation and early evolution of galaxies.
Keith M. Ashman, Stephen E. Zepf
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Globular clusters are roughly spherical, densely packed groups of stars found around galaxies. Most globular clusters probably formed at the same time as their host galaxies. They therefore provide a unique fossil record of the conditions during the formation and early evolution of galaxies.
Keith M. Ashman, Stephen E. Zepf
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Science, 2002
Globular clusters--compact assemblies of stars that typically contain ~100,000 to ~1,000,000 stars--are relics from the time when galaxies first formed. In her Perspective, [Johnson][1] reviews recent observations of very young clusters in starburst galaxies. The results suggest that we may be observing the birth of globular clusters for the first time.
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Globular clusters--compact assemblies of stars that typically contain ~100,000 to ~1,000,000 stars--are relics from the time when galaxies first formed. In her Perspective, [Johnson][1] reviews recent observations of very young clusters in starburst galaxies. The results suggest that we may be observing the birth of globular clusters for the first time.
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2015
Globular clusters are a unique system of stars in the universe. With the exception of the Ultra Compact Dwarfs (Chap. 1), no other stellar grouping contains so many stars compacted into such a small volume. A typical cluster will contain over 100,000 stars in a volume of 1,000,000 cubic light years. However, this is slightly misleading.
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Globular clusters are a unique system of stars in the universe. With the exception of the Ultra Compact Dwarfs (Chap. 1), no other stellar grouping contains so many stars compacted into such a small volume. A typical cluster will contain over 100,000 stars in a volume of 1,000,000 cubic light years. However, this is slightly misleading.
openaire +1 more source