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White dwarf evolutionary sequences for low-metallicity progenitors: The impact of third dredge-up
dc.contributor.author | Althaus, Leandro G. |
dc.contributor.author | Camisassa, Maria E |
dc.contributor.author | Miller Bertolami, Marcelo M |
dc.contributor.author | Corsico, Alejandro H. |
dc.contributor.author | García-Berro Montilla, Enrique |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física Aplicada |
dc.date.accessioned | 2015-05-07T11:00:21Z |
dc.date.available | 2015-05-07T11:00:21Z |
dc.date.created | 2015-04-01 |
dc.date.issued | 2015-04-01 |
dc.identifier.citation | Althaus, L. G. [et al.]. White dwarf evolutionary sequences for low-metallicity progenitors: The impact of third dredge-up. "Astronomy and astrophysics", 01 Abril 2015, vol. 576. |
dc.identifier.issn | 0004-6361 |
dc.identifier.uri | http://hdl.handle.net/2117/27813 |
dc.description.abstract | Context. White dwarfs are nowadays routinely used as reliable cosmochronometers, allowing several stellar populations to be dated.; Aims. We present new white dwarf evolutionary sequences for low-metallicity progenitors. This is motivated by the recent finding that residual H burning in low-mass white dwarfs resulting from Z = 0.0001 progenitors is the main energy source over a significant part of their evolution.; Methods. White dwarf sequences have been derived from full evolutionary calculations that take the entire history of progenitor stars into account, including the thermally pulsing and the post-asymptotic giant branch (AGB) phases.; Results. We show that for progenitor metallicities in the range 0.00003 less than or similar to Z less than or similar to 0.001, and in the absence of carbon enrichment from the occurrence of a third dredge-up episode, the resulting H envelope of the low-mass white dwarfs is thick enough to make stable H burning the most important energy source even at low luminosities. This has a significant impact on white dwarf cooling times. This result is independent of the adopted mass-loss rate during the thermally-pulsing and post-AGB phases and in the planetary nebulae stage.; Conclusions. We conclude that in the absence of third dredge-up episodes, a significant part of the evolution of low-mass white dwarfs resulting from low-metallicity progenitors is dominated by stable H burning. Our study opens the possibility of using the observed white dwarf luminosity function of low-metallicity globular clusters to constrain the efficiency of third dredge up episodes during the thermally-pulsing AGB phase of low-metallicity progenitors. |
dc.language.iso | eng |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
dc.subject.lcsh | White dwarf stars |
dc.subject.lcsh | Starts -- Evolution |
dc.subject.other | stars: evolution |
dc.subject.other | stars: interiors |
dc.subject.other | white dwarfs |
dc.subject.other | ZZ-CETI STARS |
dc.subject.other | PULSATIONAL PROPERTIES |
dc.subject.other | COOLING SEQUENCES |
dc.subject.other | GLOBULAR-CLUSTER |
dc.subject.other | MASS |
dc.subject.other | MODELS |
dc.subject.other | AGE |
dc.subject.other | OPACITIES |
dc.subject.other | HYDROGEN |
dc.subject.other | ASTEROSEISMOLOGY |
dc.title | White dwarf evolutionary sequences for low-metallicity progenitors: The impact of third dredge-up |
dc.type | Article |
dc.subject.lemac | Estels nans |
dc.contributor.group | Universitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica |
dc.identifier.doi | 10.1051/0004-6361/201424922 |
dc.description.peerreviewed | Peer Reviewed |
dc.rights.access | Open Access |
local.identifier.drac | 15608753 |
dc.description.version | Postprint (author’s final draft) |
local.citation.author | Althaus, L. G.; Camisassa, M.; Miller, M.; Corsico, A.; Garcia-berro, E. |
local.citation.publicationName | Astronomy and astrophysics |
local.citation.volume | 576 |
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