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dc.contributor.authorWinget, Donald Earlpt_BR
dc.contributor.authorKepler, Souza Oliveirapt_BR
dc.contributor.authorCampos, Fabíolapt_BR
dc.contributor.authorMontgomery, Michael Houstonpt_BR
dc.contributor.authorGirardi, Leo Albertopt_BR
dc.contributor.authorBergeron, Pierrept_BR
dc.contributor.authorWilliams, Kurtispt_BR
dc.date.accessioned2015-01-15T02:15:10Zpt_BR
dc.date.issued2009pt_BR
dc.identifier.issn0004-637Xpt_BR
dc.identifier.urihttp://hdl.handle.net/10183/108972pt_BR
dc.description.abstractWe explore the physics of crystallization in the deep interiors of white dwarf (WD) stars using the color–magnitude diagram and luminosity function constructed from proper-motion cleaned Hubble Space Telescope photometry of the globular cluster NGC 6397. We demonstrate that the data are consistent with the theory of crystallization of the ions in the interior of WD stars and provide the first empirical evidence that the phase transition is first order: latent heat is released in the process of crystallization as predicted by van Horn. We outline how these data can be used to observationally constrain the value of Γ ≡ ECoulomb/Ethermal near the onset of crystallization, the central carbon/oxygen abundance, and the importance of phase separation.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofThe astrophysical journal. Bristol. Vol. 693, no. 1, pt. 2 (Mar. 2009), p. L6-L10pt_BR
dc.rightsOpen Accessen
dc.subjectDense matteren
dc.subjectFotometria estelarpt_BR
dc.subjectAglomerados globularespt_BR
dc.subjectEquation of stateen
dc.subjectGlobular clusters: individual (NGC 6397)en
dc.subjectMovimento estelarpt_BR
dc.subjectAnãs brancaspt_BR
dc.subjectStars: luminosity function, mass functionen
dc.subjectWhite dwarfsen
dc.titleThe physics of crystallization from globular cluster white dwarf stars in NGC 6397pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000766345pt_BR
dc.type.originEstrangeiropt_BR


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