Explaining Lithium Enriched Red Giant Branch Stars: Springer Theses
Autor Claudia Aguilera-Gómezen Limba Engleză Hardback – 10 dec 2018
The author addresses this problem, analyzing the different possible explanations for such an anomaly, which include interaction with a binary companion, the production of Li in the interior of the star with its subsequent transport to stellar exteriors, and the stellar interaction with planets. The author focuses on this last possibility, where the Li enrichment may be due to the ingestion of planets or brown dwarfs as the stars in question grew in size while becoming giants. She shows that this process is indeed able to explain an important fraction of giants with Li levels above the three times solar threshold, but that some other mechanism is needed to explain the remaining fraction. While this is an important discovery in its own right, the result that makes this thesis groundbreaking is its demonstration that the threshold between Li-normal and Li-rich is mass dependent rather than a fixed proportion of the Sun’s content. This corrects a fundamental misapprehension of the phenomenon and opens up a new framework in which to understand and solve the problem.
Finally, the author presents interesting observational applications and samples with which to test this new approach to the problem of Li enrichment in giants.
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Specificații
ISBN-13: 9783030025823
ISBN-10: 3030025829
Pagini: 169
Ilustrații: XIII, 131 p. 43 illus., 23 illus. in color.
Dimensiuni: 155 x 235 mm
Greutate: 0.39 kg
Ediția:1st ed. 2018
Editura: Springer International Publishing
Colecția Springer
Seria Springer Theses
Locul publicării:Cham, Switzerland
ISBN-10: 3030025829
Pagini: 169
Ilustrații: XIII, 131 p. 43 illus., 23 illus. in color.
Dimensiuni: 155 x 235 mm
Greutate: 0.39 kg
Ediția:1st ed. 2018
Editura: Springer International Publishing
Colecția Springer
Seria Springer Theses
Locul publicării:Cham, Switzerland
Cuprins
Chapter1. Introduction.- Part I. Scenarios of Lithium Enrichment.- Chapter2. Internal Mechanisms.- Chapter3. External Mechanisms.- Part II. Observational Applications.- Chapter4. Trumpler 20.- Chapter5. Field Giants.- Chapter6. Stars with Low Main Sequence Li Abundances.
Notă biografică
Claudia Aguilera-Gómez received her PhD in 2017 from Institute of Astrophysics at the Pontificia Universidad Católica de Chile. She currently holds a position at Universidad Andrés Bello, Chile.
Textul de pe ultima copertă
This thesis provides new insights into the seemingly anomalous ubiquity of lithium-rich red giant stars. The theory of stellar evolution, one of the most successful models of modern astrophysics, predicts that red giant stars should display negligible levels of lithium (Li) on their surfaces. However, Li-rich giants, defined as those showing more than three times the Li content of the Sun, are found everywhere astronomers look in apparent defiance of established theory.
The author addresses this problem, analyzing the different possible explanations for such an anomaly, which include interaction with a binary companion, the production of Li in the interior of the star with its subsequent transport to stellar exteriors, and the stellar interaction with planets. The author focuses on this last possibility, where the Li enrichment may be due to the ingestion of planets or brown dwarfs as the stars in question grew in size while becoming giants. She shows that this process is indeed able to explain an important fraction of giants with Li levels above the three times solar threshold, but that some other mechanism is needed to explain the remaining fraction. While this is an important discovery in its own right, the result that makes this thesis groundbreaking is its demonstration that the threshold between Li-normal and Li-rich is mass dependent rather than a fixed proportion of the Sun’s content. This corrects a fundamental misapprehension of the phenomenon and opens up a new framework in which to understand and solve the problem.
Finally, the author presents interesting observational applications and samples with which to test this new approach to the problem of Li enrichment in giants.
The author addresses this problem, analyzing the different possible explanations for such an anomaly, which include interaction with a binary companion, the production of Li in the interior of the star with its subsequent transport to stellar exteriors, and the stellar interaction with planets. The author focuses on this last possibility, where the Li enrichment may be due to the ingestion of planets or brown dwarfs as the stars in question grew in size while becoming giants. She shows that this process is indeed able to explain an important fraction of giants with Li levels above the three times solar threshold, but that some other mechanism is needed to explain the remaining fraction. While this is an important discovery in its own right, the result that makes this thesis groundbreaking is its demonstration that the threshold between Li-normal and Li-rich is mass dependent rather than a fixed proportion of the Sun’s content. This corrects a fundamental misapprehension of the phenomenon and opens up a new framework in which to understand and solve the problem.
Finally, the author presents interesting observational applications and samples with which to test this new approach to the problem of Li enrichment in giants.
Caracteristici
Nominated as an outstanding thesis by Pontificia Universidad Católica de Chile Presents a groundbreaking insight into the phenomena of lithium-rich red giant stars by proposing a new, mass-dependent criteria for lithium-richness, opening up new avenues of research Gives a partial explanation of the anomalous ubiquity of lithium-rich red giant stars