Browsing by Author "Karakas, A. I."

Browsing by Author "Karakas, A. I."

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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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    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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    A new synthetic model for asymptotic giant branch stars 
    Izzard, Robert G.; Tout, Christopher A.; Karakas, A. I.; Pols, Onno R. (Royal Astronomical SocietyOxford University Press, 2004)
    We present a synthetic model for thermally pulsing asymptotic giant branch (TPAGB) evolution constructed by fitting expressions to full evolutionary models in the metallicity range 0.0001 [less than or equal to] Z [less ...

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    Reaction rate uncertainties and the production of [superscript 19]F in asymptotic giant branch stars 
    Lugaro, Maria; Ugalde, Claudio; Karakas, A. I.; Gorres, Joachim; Wiescher, Michael; Lattanzio, John C.; Cannon, Robert C. (American Astronomical SocietyIOP Publishing, 2004-11-10)
    We present nucleosynthesis calculations and the resulting [superscript 19]F stellar yields for a large set of models with different masses and metallicity. During the asymptotic giant branch (AGB) phase, [superscript 19]F ...

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    The structure of close binaries in two dimensions 
    Deupree, Robert G. (Robert Gaston), 1946-; Karakas, A. I. (American Astronomical Society, 2005-11)
    The structure and evolution of close binary stars has been studied using the two-dimensional stellar structure algorithm developed by Deupree. We have calculated a series of solar composition stellar evolution sequences ...

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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 ...