Document Detail


Crystallization of carbon-oxygen mixtures in white dwarf stars.
MedLine Citation:
PMID:  20867223     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
We determine the phase diagram for dense carbon-oxygen mixtures in white dwarf (WD) star interiors using molecular dynamics simulations involving liquid and solid phases. Our phase diagram agrees well with predictions from Ogata et al. and from Medin and Cumming and gives lower melting temperatures than Segretain et al. Observations of WD crystallization in the globular cluster NGC 6397 by Winget et al. suggest that the melting temperature of WD cores is close to that for pure carbon. If this is true, our phase diagram implies that the central oxygen abundance in these stars is less than about 60%. This constraint, along with assumptions about convection in stellar evolution models, limits the effective S factor for the 12C(α,γ)16O reaction to S(300)≤170  keV b.
Authors:
C J Horowitz; A S Schneider; D K Berry
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Publication Detail:
Type:  Journal Article     Date:  2010-06-07
Journal Detail:
Title:  Physical review letters     Volume:  104     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-09-27     Completed Date:  2011-01-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  231101     Citation Subset:  -    
Affiliation:
Department of Physics and Nuclear Theory Center, Indiana University, Bloomington, Indiana 47405, USA. horowit@indiana.edu
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