LEADER 03786nam 22004815 450 001 9910300531603321 005 20200706030141.0 010 $a3-030-02583-7 024 7 $a10.1007/978-3-030-02583-0 035 $a(CKB)4100000007181170 035 $a(MiAaPQ)EBC5606714 035 $a(DE-He213)978-3-030-02583-0 035 $a(PPN)232468923 035 $a(EXLCZ)994100000007181170 100 $a20181128d2018 u| 0 101 0 $aeng 135 $aurcnu|||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aExplaining Lithium Enriched Red Giant Branch Stars$b[electronic resource] /$fby Claudia Aguilera-Gómez 205 $a1st ed. 2018. 210 1$aCham :$cSpringer International Publishing :$cImprint: Springer,$d2018. 215 $a1 online resource (139 pages) 225 1 $aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 311 $a3-030-02582-9 327 $aChapter1. 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. 330 $aThis thesis provides new insights into the seemingly anomalous ubiquity of lithium-rich red giant stars. The theory of stellar evolution, one of the most successful models of modern astrophysics, predicts that red giant stars should display negligible levels of lithium (Li) on their surfaces. However, Li-rich giants, defined as those showing more than three times the Li content of the Sun, are found everywhere astronomers look in apparent defiance of established theory. The author addresses this problem, analyzing the different possible explanations for such an anomaly, which include interaction with a binary companion, the production of Li in the interior of the star with its subsequent transport to stellar exteriors, and the stellar interaction with planets. The author focuses on this last possibility, where the Li enrichment may be due to the ingestion of planets or brown dwarfs as the stars in question grew in size while becoming giants. She shows that this process is indeed able to explain an important fraction of giants with Li levels above the three times solar threshold, but that some other mechanism is needed to explain the remaining fraction. While this is an important discovery in its own right, the result that makes this thesis groundbreaking is its demonstration that the threshold between Li-normal and Li-rich is mass dependent rather than a fixed proportion of the Sun?s content. This corrects a fundamental misapprehension of the phenomenon and opens up a new framework in which to understand and solve the problem. Finally, the author presents interesting observational applications and samples with which to test this new approach to the problem of Li enrichment in giants. 410 0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 606 $aAstrophysics 606 $aMathematical physics 606 $aAstrophysics and Astroparticles$3https://scigraph.springernature.com/ontologies/product-market-codes/P22022 606 $aTheoretical Astrophysics$3https://scigraph.springernature.com/ontologies/product-market-codes/P22080 615 0$aAstrophysics. 615 0$aMathematical physics. 615 14$aAstrophysics and Astroparticles. 615 24$aTheoretical Astrophysics. 676 $a523.88 700 $aAguilera-Gómez$b Claudia$4aut$4http://id.loc.gov/vocabulary/relators/aut$0835173 906 $aBOOK 912 $a9910300531603321 996 $aExplaining Lithium Enriched Red Giant Branch Stars$91866563 997 $aUNINA