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dc.contributor.authorAlthaus, Leandro Gabrielpt_BR
dc.contributor.authorCórsico, Alejandro Hugopt_BR
dc.contributor.authorBertolami, Marcelo Miguel Millerpt_BR
dc.contributor.authorGarcía-Berro, Enriquept_BR
dc.contributor.authorKepler, Souza Oliveirapt_BR
dc.date.accessioned2015-01-15T02:15:07Zpt_BR
dc.date.issued2008pt_BR
dc.identifier.issn0004-637Xpt_BR
dc.identifier.urihttp://hdl.handle.net/10183/108966pt_BR
dc.description.abstractWe present evidence that PG 1159 stars could harbor He-rich envelopes substantially thinner than those predicted by current evolutionary models with current estimates of mass loss, which may be attributable to an extensive mass-loss episode during the born-again AGB phase. Specifically, we show that the models with thin He-rich envelopes predict remarkably large magnitudes of the rates of period change of the trapped and untrapped modes observed in the pulsating star PG 1159−035. This is a consequence of the much shorter evolutionary timescale of the models with thin He-rich envelopes during the low-gravity PG 1159 regime. Our findings are particularly interesting in view of the suggestion of an evolutionary link between the helium-deficient PG 1159 star H1504+65 and the recently discovered white dwarfs with almost pure carbon atmospheres.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofThe astrophysical journal. Chicago. Vol. 677, no. 1, pt. 2 (Apr. 2008), p. L35-L38pt_BR
dc.rightsOpen Accessen
dc.subjectDense matteren
dc.subjectEvolucao estelarpt_BR
dc.subjectInterior estelarpt_BR
dc.subjectDiffusionen
dc.subjectStars: abundancesen
dc.subjectAnãs brancaspt_BR
dc.subjectStars: evolutionen
dc.subjectAtmosferas estelarespt_BR
dc.subjectMatéria circumestelarpt_BR
dc.subjectStars: interiorsen
dc.subjectWhite dwarfsen
dc.subjectHéliopt_BR
dc.titleEvidence of thin helium envelopes in PG 1159 starspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000634685pt_BR
dc.type.originEstrangeiropt_BR


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