A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
- Autores
- García Berro, Enrique; Torres, Santiago; Althaus, Leandro Gabriel; Renedo, I.; Lorén Aguilar, Pablo; Córsico, Alejandro Hugo; Rohrmann, René D.; Salaris, Maurizio; Isern, Jordi
- Año de publicación
- 2010
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- NGC 6791 is a well studied open cluster1 that it is so close to us that can be imaged down to very faint luminosities. The mainsequence turn-off age (∼8 Gyr) and the age derived from the termination of the white dwarf cooling sequence (∼6 Gyr) are very different. One possible explanation is that as white dwarfs cool, one of the ashes of helium burning, 22Ne, sinks in the deep interior of these stars. At lower temperatures, white dwarfs are expected to crystallize and phase separation of the main constituents of the core of a typical white dwarf (12C and 16O) is expected to occur. This sequence of events is expected to introduce long delays in the cooling times, but has not hitherto been proven. Here we report that, as theoretically anticipated, physical separation processes occur in the cores of white dwarfs, resolving the age discrepancy for NGC 6791.
Facultad de Ciencias Astronómicas y Geofísicas - Materia
-
Ciencias Astronómicas
NGC 6791
Estrellas - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/123929
Ver los metadatos del registro completo
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A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processesGarcía Berro, EnriqueTorres, SantiagoAlthaus, Leandro GabrielRenedo, I.Lorén Aguilar, PabloCórsico, Alejandro HugoRohrmann, René D.Salaris, MaurizioIsern, JordiCiencias AstronómicasNGC 6791EstrellasNGC 6791 is a well studied open cluster1 that it is so close to us that can be imaged down to very faint luminosities. The mainsequence turn-off age (∼8 Gyr) and the age derived from the termination of the white dwarf cooling sequence (∼6 Gyr) are very different. One possible explanation is that as white dwarfs cool, one of the ashes of helium burning, 22Ne, sinks in the deep interior of these stars. At lower temperatures, white dwarfs are expected to crystallize and phase separation of the main constituents of the core of a typical white dwarf (12C and 16O) is expected to occur. This sequence of events is expected to introduce long delays in the cooling times, but has not hitherto been proven. Here we report that, as theoretically anticipated, physical separation processes occur in the cores of white dwarfs, resolving the age discrepancy for NGC 6791.Facultad de Ciencias Astronómicas y Geofísicas2010-05-13info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf194-196http://sedici.unlp.edu.ar/handle/10915/123929enginfo:eu-repo/semantics/altIdentifier/issn/1476-4687info:eu-repo/semantics/altIdentifier/issn/0028-0836info:eu-repo/semantics/altIdentifier/arxiv/1005.2272info:eu-repo/semantics/altIdentifier/pmid/20463732info:eu-repo/semantics/altIdentifier/doi/10.1038/nature09045info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T17:10:20Zoai:sedici.unlp.edu.ar:10915/123929Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 17:10:20.396SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes |
| title |
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes |
| spellingShingle |
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes García Berro, Enrique Ciencias Astronómicas NGC 6791 Estrellas |
| title_short |
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes |
| title_full |
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes |
| title_fullStr |
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes |
| title_full_unstemmed |
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes |
| title_sort |
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes |
| dc.creator.none.fl_str_mv |
García Berro, Enrique Torres, Santiago Althaus, Leandro Gabriel Renedo, I. Lorén Aguilar, Pablo Córsico, Alejandro Hugo Rohrmann, René D. Salaris, Maurizio Isern, Jordi |
| author |
García Berro, Enrique |
| author_facet |
García Berro, Enrique Torres, Santiago Althaus, Leandro Gabriel Renedo, I. Lorén Aguilar, Pablo Córsico, Alejandro Hugo Rohrmann, René D. Salaris, Maurizio Isern, Jordi |
| author_role |
author |
| author2 |
Torres, Santiago Althaus, Leandro Gabriel Renedo, I. Lorén Aguilar, Pablo Córsico, Alejandro Hugo Rohrmann, René D. Salaris, Maurizio Isern, Jordi |
| author2_role |
author author author author author author author author |
| dc.subject.none.fl_str_mv |
Ciencias Astronómicas NGC 6791 Estrellas |
| topic |
Ciencias Astronómicas NGC 6791 Estrellas |
| dc.description.none.fl_txt_mv |
NGC 6791 is a well studied open cluster1 that it is so close to us that can be imaged down to very faint luminosities. The mainsequence turn-off age (∼8 Gyr) and the age derived from the termination of the white dwarf cooling sequence (∼6 Gyr) are very different. One possible explanation is that as white dwarfs cool, one of the ashes of helium burning, 22Ne, sinks in the deep interior of these stars. At lower temperatures, white dwarfs are expected to crystallize and phase separation of the main constituents of the core of a typical white dwarf (12C and 16O) is expected to occur. This sequence of events is expected to introduce long delays in the cooling times, but has not hitherto been proven. Here we report that, as theoretically anticipated, physical separation processes occur in the cores of white dwarfs, resolving the age discrepancy for NGC 6791. Facultad de Ciencias Astronómicas y Geofísicas |
| description |
NGC 6791 is a well studied open cluster1 that it is so close to us that can be imaged down to very faint luminosities. The mainsequence turn-off age (∼8 Gyr) and the age derived from the termination of the white dwarf cooling sequence (∼6 Gyr) are very different. One possible explanation is that as white dwarfs cool, one of the ashes of helium burning, 22Ne, sinks in the deep interior of these stars. At lower temperatures, white dwarfs are expected to crystallize and phase separation of the main constituents of the core of a typical white dwarf (12C and 16O) is expected to occur. This sequence of events is expected to introduce long delays in the cooling times, but has not hitherto been proven. Here we report that, as theoretically anticipated, physical separation processes occur in the cores of white dwarfs, resolving the age discrepancy for NGC 6791. |
| publishDate |
2010 |
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2010-05-13 |
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eng |
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