Browsing Articles by Subject "Cosmic abundances"

Browsing Articles by Subject "Cosmic abundances"

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    The chemical evolution of globular clusters – II. Metals and fluorine 
    Sanchez-Blazquez, P.; Marcolini, A.; Gibson, Brad K.; Karakas, A. I.; Pilkington, K.; Calura, F. (Oxford University Press, 2012-01)
    In the first paper of this series, we proposed a new framework in which to model the chemical evolution of globular clusters. This model is predicated upon the assumption that clusters form within an interstellar medium ...

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    The distribution of metals in cosmological hydrodynamical simulations of dwarf disc galaxies 
    Pilkington, K.; Gibson, Brad K.; Brook, C. B.; Calura, F.; Stinson, G. S.; Thacker, Robert John, 1970-; Michel-Dansac, L.; Bailin, J.; Couchman, H. M. P.; Wadsley, J. (Oxford University Press, 2012-09)
    We examine the chemical properties of five cosmological hydrodynamical simulations of an M33-like disc galaxy which have been shown previously to be consistent with the morphological characteristics and bulk scaling relations ...

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    Metal-poor lithium-rich giants in the radial velocity experiment survey 
    Ruchti, Gregory R.; Fulbright, Jon P.; Wyse, Rosemary F. G.; Gilmore, Gerard F.; Grebel, Eva K.; Bienayme, Olivier; Bland-Hawthorn, Joss; Freeman, Ken C.; Gibson, Brad K.; Munari, Ulisse (IOP Publishing Limited, 2011-12-20)
    We report the discovery of eight lithium-rich field giants found in a high-resolution spectroscopic sample of over 700 metal-poor stars ([Fe/H] < −0.5) selected from the Radial Velocity Experiment survey. The ...

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    Metallicity gradients in disks: Do galaxies form inside-out? 
    Pilkington, K.; Few, C. G.; Gibson, Brad K.; Calura, F.; Michel-Dansac, L.; Thacker, Robert John, 1970-; Molla, M.; Matteucci, F.; Rahimi, A.; Kawata, D. (EDP Sciences, 2012-04)
    Aims. We examine radial and vertical metallicity gradients using a suite of disk galaxy hydrodynamical simulations, supplemented with two classic chemical evolution approaches. We determine the rate of change of gradient ...

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    Modelling self-pollution of globular clusters from asymptotic giant branch stars 
    Fenner, Y.; Campbell, S.; Karakas, A. I.; Lattanzio, J. C.; Gibson, Brad K. (Royal Astronomical SocietyOxford University Press, 2004)
    A self-consistent model of the chemical evolution of the globular cluster NGC 6752 is presented to test a popular theory that observed abundance anomalies are due to ‘internal pollution’ from intermediate-mass asymptotic ...

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    Solar abundance ratios of the iron-peak elements in the Perseus cluster 
    Hitomi Collaboration; Aharonian, F.; Akamatsu, H.; Akimoto, F.; Allen, S. W.; Angelini, L.; Audard, M.; Awaki, H.; Axelsson, M.; Bamba, A.; Bautz, M. W.; Gallo, Luigi C. (Springer Nature, 2017-11--2)
    The metal abundance of the hot plasma that permeates galaxy clusters represents the accumulation of heavy elements produced by billions of supernovae1. Therefore, X-ray spectroscopy of the intracluster medium ...

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    The uncertainties in the [superscript 22]Ne+[alpha]-capture reaction rates and the production of the heavy magnesium isotopes in asymptotic giant branch stars of intermediate mass 
    Karakas, A. I.; Lugaro, M. A.; Wiescher, M.; Gorres, J.; Ugalde, C. (American Astronomical Society, 2006-05-20)
    We present new rates for the [superscript 22]Ne([alpha], n)[superscript 25]Mg and [superscript 22]Ne([alpha], [gamma])[superscript 26]Mg reactions, with uncertainties that have been considerably reduced compared to previous ...

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