Modeling convective core overshoot and diffusion in Procyon constrained by asteroseismic data

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dc.creator Guenther, David B.
dc.creator Demarque, P.
dc.creator Gruberbauer, Michael
dc.date.accessioned 2018-03-28T15:38:21Z
dc.date.available 2018-03-28T15:38:21Z
dc.date.issued 2014-06-01
dc.identifier.issn 0004-637X
dc.identifier.uri http://library2.smu.ca/handle/01/27385
dc.description Publisher's Version/PDF
dc.description.abstract We compare evolved stellar models, which match Procyon&rsquo;s mass and position in the HR diagram, to current groundbased asteroseismic observations. Diffusion of helium and metals along with two conventional core overshoot descriptions and the Kuhfuss nonlocal theory of convection are considered. We establish that one of the two published asteroseismic data reductions for Procyon, which mainly differ in their identification of even versus odd l values, is a significantly more probable and self-consistent match to our models than the other. The most probable models according to our Bayesian analysis have evolved to just short of turnoff, still retaining a hydrogen convective core. Our most probable models include Y and Z diffusion and have conventional core overshoot between 0.9 and 1.5 pressure scale heights, which increases the outer radius of the convective core by between 36% and 43%, respectively. We discuss the significance of this comparatively higher than expected core overshoot amount in terms of internal mixing during evolution. The parameters of our most probable models are similar regardless of whether adiabatic or nonadiabatic model p-mode frequencies are compared to the observations, although, the Bayesian probabilities are greater when the nonadiabatic model frequencies are used. All the most probable models (with or without core overshoot, adiabatic or nonadiabatic model frequencies, diffusion or no diffusion, including priors for the observed HRD location and mass or not) have masses that are within 1&sigma; of the observed mass 1.497 &plusmn; 0.037M<sub>☉</sub>. en_CA
dc.language.iso en en_CA
dc.publisher IOP Publishing Limited en_CA
dc.relation.uri https://dx.doi.org/10.1088/0004-637X/787/2/164
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Convection (Astrophysics)
dc.subject.lcsh Stars -- Evolution
dc.subject.lcsh Astroseismology
dc.subject.lcsh Variable stars
dc.title Modeling convective core overshoot and diffusion in Procyon constrained by asteroseismic data en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal 787(2), 164. (2014) en_CA


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: https://dx.doi.org/10.1088/0004-637X/787/2/164
 
 

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