國立虎尾科技大學 |

Explaining Lithium Enriched Red Giant Branch Stars

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Explaining Lithium Enriched Red Giant Branch Stars/ by Claudia Aguilera-Gómez.
Author:	Aguilera-Gómez, Claudia.
Description:	XIII, 131 p. 43 illus., 23 illus. in color.online resource. :
Contained By:	Springer Nature eBook
Subject:	Astrophysics. -
Online resource:	https://doi.org/10.1007/978-3-030-02583-0
ISBN:	9783030025830

Explaining Lithium Enriched Red Giant Branch Stars
Aguilera-Gómez, Claudia.

Explaining Lithium Enriched Red Giant Branch Stars[electronic resource] /by Claudia Aguilera-Gómez. - 1st ed. 2018. - XIII, 131 p. 43 illus., 23 illus. in color.online resource. - Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053. - Springer Theses, Recognizing Outstanding Ph.D. Research,.

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.

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.

ISBN: 9783030025830

Standard No.: 10.1007/978-3-030-02583-0doiSubjects--Topical Terms:

646223
Astrophysics.

LC Class. No.: QB460-466

Dewey Class. No.: 523.01

Explaining Lithium Enriched Red Giant Branch Stars
LDR:03388nam a22003975i 4500 001 988971
003 DE-He213
005 20200706030141.0
007 cr nn 008mamaa
008 201225s2018 gw | s |||| 0|eng d
020 $a 9783030025830 $9 978-3-030-02583-0
024 7 $a 10.1007/978-3-030-02583-0 $2 doi
035 $a 978-3-030-02583-0
050 4 $a QB460-466
072 7 $a PHVB $2 bicssc
072 7 $a SCI005000 $2 bisacsh
072 7 $a PHVB $2 thema
082 0 4 $a 523.01 $2 23
100 1 $a Aguilera-Gómez, Claudia. $e author. $4 aut $4 http://id.loc.gov/vocabulary/relators/aut $3 1280963
245 1 0 $a Explaining Lithium Enriched Red Giant Branch Stars $h [electronic resource] / $c by Claudia Aguilera-Gómez.
250 $a 1st ed. 2018.
264 1 $a Cham : $b Springer International Publishing : $b Imprint: Springer, $c 2018.
300 $a XIII, 131 p. 43 illus., 23 illus. in color. $b online resource.
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
347 $a text file $b PDF $2 rda
490 1 $a Springer Theses, Recognizing Outstanding Ph.D. Research, $x 2190-5053
505 0 $a 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.
520 $a 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.
650 0 $a Astrophysics. $3 646223
650 0 $a Mathematical physics. $3 527831
650 1 4 $a Astrophysics and Astroparticles. $3 782546
650 2 4 $a Theoretical Astrophysics. $3 1207848
710 2 $a SpringerLink (Online service) $3 593884
773 0 $t Springer Nature eBook
776 0 8 $i Printed edition: $z 9783030025823
776 0 8 $i Printed edition: $z 9783030025847
830 0 $a Springer Theses, Recognizing Outstanding Ph.D. Research, $x 2190-5053 $3 1253569
856 4 0 $u https://doi.org/10.1007/978-3-030-02583-0
912 $a ZDB-2-PHA
912 $a ZDB-2-SXP
950 $a Physics and Astronomy (SpringerNature-11651)
950 $a Physics and Astronomy (R0) (SpringerNature-43715)