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| DOI | 10.3847/1538-4357/AC70C8 | ||||
| Año | 2022 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Known sources of lithium (Li) in the universe include the Big Bang, novae, asymptotic giant branch stars, and cosmic-ray spallation. During their longer-lived evolutionary phases, stars are not expected to add to the Li budget of the Galaxy, but to largely deplete it. In this context, recent analyses of Li data from GALAH and LAMOST for field red clump (RC) stars have concluded that there is the need for a new production channel of Li, ubiquitous among low-mass stars, and that would be triggered on the upper red giant branch (RGB) or at helium ignition. This is distinct from the Li-rich giant problem and reflects bulk RC star properties. We provide an analysis of the GALAH Li data that accounts for the distribution of progenitor masses of field RC stars observed today. Such progenitors are different than today's field RGB stars. Using standard post-main-sequence stellar evolution, we show that the distribution of Li among field RC giants as observed by GALAH is consistent with standard model predictions, and does not require new Li production mechanisms. Our model predicts a large fraction of very low Li abundances from low-mass progenitors, with higher abundances from higher mass ones. Moreover, there should be a large number of upper limits for RC giants, and higher abundances should correspond to higher masses. The most recent GALAH data indeed confirm the presence of large numbers of upper limits, and a much lower mean Li abundance in RC stars, in concordance with our interpretation.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | CHANAME-DOMINGUEZ, JULIO CESAR | Hombre |
Pontificia Universidad Católica de Chile - Chile
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| 2 | Pinsonneault, Marc H. | Hombre |
The Ohio State University - Estados Unidos
OHIO STATE UNIV - Estados Unidos |
| 3 | Aguilera-Gomez, Claudia | Mujer |
Universidad Diego Portales - Chile
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| 4 | Zinn, Joel | Hombre |
American Museum of Natural History - Estados Unidos
AMER MUSEUM NAT HIST - Estados Unidos |
| Fuente |
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| Fondo Nacional de Desarrollo Científico y Tecnológico |
| Centro de Astrofísica y Tecnologías Afines |
| ANID Fondecyt |
| Agencia Nacional de Investigación y Desarrollo |
| Directorate for Mathematical and Physical Sciences |
| Agencia Nacional de Investigacion y Desarrollo (ANID) via Proyecto Fondecyt Regular |
| ANID FONDECYT Postdoctoral Fellowship 2018 |
| Centro de Astronomia y Tecnologias Afines project BASAL |
| Agradecimiento |
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| We are grateful to the referee for an insightful and useful report that clarified our messages and improved this paper throughout. We thank Con Deliyannis for providing us data on lithium as a function of stellar mass for stars in NGC 6819, which we use to set the initial conditions of our simulations. J.C. acknowledges support from the Agencia Nacional de Investigación y Desarrollo (ANID) via Proyecto Fondecyt Regular 1191366; and from the Centro de Astronomía y Tecnologías Afines project BASAL AFB-170002. C.A.G. acknowledges financial support from ANID FONDECYT Postdoctoral Fellowship 2018 Project 3180668. |
| We are grateful to the referee for an insightful and useful report that clarified our messages and improved this paper throughout. We thank Con Deliyannis for providing us data on lithium as a function of stellar mass for stars in NGC 6819, which we use to set the initial conditions of our simulations. J.C. acknowledges support from the Agencia Nacional de Investigacion y Desarrollo (ANID) via Proyecto Fondecyt Regular 1191366; and from the Centro de Astronomia y Tecnologias Afines project BASAL AFB-170002. C.A.G. acknowledges financial support from ANID FONDECYT Postdoctoral Fellowship 2018 Project 3180668. |