Evidence of thin helium envelopes in PG 1159 stars
dc.contributor.author | Althaus, Leandro Gabriel | pt_BR |
dc.contributor.author | Córsico, Alejandro Hugo | pt_BR |
dc.contributor.author | Bertolami, Marcelo Miguel Miller | pt_BR |
dc.contributor.author | García-Berro, Enrique | pt_BR |
dc.contributor.author | Kepler, Souza Oliveira | pt_BR |
dc.date.accessioned | 2015-01-15T02:15:07Z | pt_BR |
dc.date.issued | 2008 | pt_BR |
dc.identifier.issn | 0004-637X | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/108966 | pt_BR |
dc.description.abstract | We 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.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | The astrophysical journal. Chicago. Vol. 677, no. 1, pt. 2 (Apr. 2008), p. L35-L38 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Dense matter | en |
dc.subject | Evolucao estelar | pt_BR |
dc.subject | Interior estelar | pt_BR |
dc.subject | Diffusion | en |
dc.subject | Stars: abundances | en |
dc.subject | Anãs brancas | pt_BR |
dc.subject | Stars: evolution | en |
dc.subject | Atmosferas estelares | pt_BR |
dc.subject | Matéria circumestelar | pt_BR |
dc.subject | Stars: interiors | en |
dc.subject | White dwarfs | en |
dc.subject | Hélio | pt_BR |
dc.title | Evidence of thin helium envelopes in PG 1159 stars | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000634685 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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