The CEMP star SDSS J0222–0313: The first evidence of proton ingestion in very low-metallicity AGB stars?

Vista sencilla de ítem
dc.contributor.authorE., Caffau
dc.contributor.authorL., Monaco
dc.contributor.authorP., Bonifacio
dc.contributor.authorS., Korotin
dc.contributor.authorS., Andrievsky
dc.contributor.authorS., Cristallo
dc.contributor.authorM., Spite
dc.contributor.authorF., Spite
dc.contributor.authorSbordone, L.
dc.contributor.authorFrançois, P.
dc.contributor.authorCescutti, G.
dc.contributor.authorSalvadori, S.
dc.date.accessioned2023-03-27T17:13:15Z
dc.date.available2023-03-27T17:13:15Z
dc.date.issued2019
dc.descriptionIndexación Scopuses
dc.description.abstractContext. Carbon-enhanced metal-poor (CEMP) stars are common objects in the metal-poor regime. The lower the metallicity we look at, the larger the fraction of CEMP stars with respect to metal-poor stars with no enhancement in carbon. The chemical pattern of CEMP stars is diversified, strongly suggesting a different origin of the C enhancement in the different types of CEMP stars. Aims. We selected a CEMP star, SDSS J0222–0313, with a known high carbon abundance and, from a low-resolution analysis, a strong enhancement in neutron-capture elements of the first peak (Sr and Y) and of the second peak (Ba). The peculiarity of this object is a greater overabundance (with respect to iron) of the first s-process peak than the second s-process peak. Methods. We analysed a high-resolution spectrum obtained with the Mike spectrograph at the Clay Magellan 6.5 m telescope in order to derive the detailed chemical composition of this star. Results. We confirmed the chemical pattern we expected; we derived abundances for a total of 18 elements and significant upper limits. Conclusions. We conclude that this star is a carbon-enhanced metal-poor star enriched in elements produced by s-process (CEMP-s), whose enhancement in heavy elements is due to mass transfer from the more evolved companion in its asymptotic giant branch (AGB) phase. The abundances imply that the evolved companion had a low main sequence mass and it suggests that it experienced a proton ingestion episode at the beginning of its AGB phase.es
dc.identifier.citationAstronomy and Astrophysics Volume 6282019 Article number A46es
dc.identifier.doi10.1051/0004-6361/201935680en
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/47916
dc.language.isoenes
dc.publisherAstronomy and Astrophysicses
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectGalaxy: haloes
dc.subjectStars: abundanceses
dc.subjectStars: carbones
dc.subjectStars: population IIes
dc.titleThe CEMP star SDSS J0222–0313: The first evidence of proton ingestion in very low-metallicity AGB stars?es
dc.typeArtículoes
Archivos
Bloque original
Mostrando 1 - 1 de 1
No hay miniatura disponible
Nombre:
The-CEMP-star-SDSS-J02220313-The-first-evidence-of-proton-ingestion-in-very-lowmetallicity-AGB-starsAstronomy-and-Astrophysics (1).pdf
Tamaño:
446.99 KB
Formato:
Adobe Portable Document Format
Descripción:
TEXTO COMPLETO EN INGLÉS
Descargar
Bloque de licencias
Mostrando 1 - 1 de 1
No hay miniatura disponible
Nombre:
license.txt
Tamaño:
1.71 KB
Formato:
Item-specific license agreed upon to submission
Descripción:
Descargar
Colecciones
FCE - Artículos de Revista