Browsing Articles by Subject "Stars -- Structure"

Browsing Articles by Subject "Stars -- Structure"

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    [alpha] Centauri AB 
    Guenther, David B.; Demarque, P. (American Astronomical Society, 2000-03)
    Detailed models of [alpha] Centauri A and B based on the Hipparcos, Yale, and Soderhjelm parallaxes are compared. The consequences of the uncertainty in mass, luminosity, surface temperature, and composition on the structure ...

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    Evolution, structure, and seismology of intermediate-mass stars 
    Guenther, David B. (American Astronomical Society, 2002-04)
    The interior structure, the evolution, and the p-mode oscillation spectra of stellar models between 2.0 and 5 M[subscript circled dot] are presented. Interior details, including convective core and envelope growth and ...

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    Matching stellar models to oscillation data 
    Guenther, David B.; Brown, Kevin I. T. (American Astronomical Society, 2004-01)
    We describe a method to match stellar models to a set of low-l p-mode oscillation frequencies. The method provides a quality of fit measure similar to that obtained from a [subscript X][superscript 2] fit. With a sufficiently ...

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    Properties of 42 solar-type Kepler targets from the Asteroseismic Modeling Portal 
    Metcalfe, T. S.; Creevey, O. L.; Drogan, G.; Mathur, S.; Xu, H.; Bedding, T. R.; Chaplin, W. J.; Christensen-Dalsgaard, J.; Karoff, C.; Trampedach, R.; Gruberbauer, Michael; Guenther, David B. (The American Astronomical Society, 2014-10)
    Recently the number of main-sequence and subgiant stars exhibiting solar-like oscillations that are resolved into individual mode frequencies has increased dramatically. While only a few such data sets were available for ...

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    Quantitative analysis of the oscillation spectrum of [eta] Bootis 
    Guenther, David B. (American Astronomical Society, 2004-09)
    We analyze the recent ground-based p-mode oscillation observations of [eta] Boo by Kjeldsen and his collaborators using a large and dense grid of stellar model oscillation spectra parameterized by mass, age, and metallicity. ...

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    Seismology of [eta] Bootis 
    Guenther, David B.; Demarque, P. (American Astronomical Society, 1996-01)
    The p-mode frequencies recently observed by Kjeldsen and coworkers, along with other observables, are used to determine the mass, age, and helium abundance of [eta] Bootis. We show, by direct application, how the p-model ...

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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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