{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/105644"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/105644","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Chemical abundance analysis of HE 2324-0215, an r-process-enhanced metal-poor star","abstract":"We report the abundance analysis of the metal-poor halo star HE 2324-0215 for 22 neutron-capture elements and 14 light elements with Z < 30. The stellar parameters are [Fe/H] = -3.05 ± 0.17, Teff = 4477 K, Vt = 2.70 kms-1 , and log(g) = 0.70, indicating that HE 2324-0215 is a red giant star. The [Eu/Fe] = 0.73 and [Ba/Eu] = -0.68 suggests that this is an r-I star. Since thorium is detectable in this star, we derived the age of the star by the means of radioactive decay, resulting in the age of 13.0 ± 1.0 Gyr. The age and the metallicity of the star suggest that HE 2324-0215 formed in a dwarf galaxy which was later accreted and became part of the Milky Way.","abstract_html":"We report the abundance analysis of the metal-poor halo star HE 2324-0215 for 22 neutron-capture elements and 14 light elements with Z &lt; 30. The stellar parameters are [Fe/H] = -3.05 ± 0.17, Teff = 4477 K, Vt = 2.70 kms-1 , and log(g) = 0.70, indicating that HE 2324-0215 is a red giant star. The [Eu/Fe] = 0.73 and [Ba/Eu] = -0.68 suggests that this is an r-I star. Since thorium is detectable in this star, we derived the age of the star by the means of radioactive decay, resulting in the age of 13.0 ± 1.0 Gyr. The age and the metallicity of the star suggest that HE 2324-0215 formed in a dwarf galaxy which was later accreted and became part of the Milky Way.","abstract_has_math":false,"creators":["Thanathibodee, Thanawuth"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Physics.","school":null,"contributors":[],"advisors":["Anna Frebel."],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016","date_published":"2016","updated_at":"2026-07-22T22:22:19Z","subjects":["Physics."],"languages":["eng"],"rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/105644","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Anna Frebel."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Department of Physics."]},{"key":"dc:contributor.other","label":"Dc Contributor Other","values":["Massachusetts Institute of Technology. Department of Physics."]},{"key":"dc:creator","label":"Author","values":["Thanathibodee, Thanawuth"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-12-05T19:56:16Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-12-05T19:56:16Z"]},{"key":"dc:date.issued","label":"Date","values":["2016"]},{"key":"dc:publisher","label":"Institution","values":["Massachusetts Institute of Technology"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://dspace.mit.edu/handle/1721.1/7582"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1721.1/105644"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2016.","Cataloged from PDF version of thesis.","Includes bibliographical references (pages 35-36)."]},{"key":"dc:description.abstract","label":"Abstract","values":["We report the abundance analysis of the metal-poor halo star HE 2324-0215 for 22 neutron-capture elements and 14 light elements with Z < 30. The stellar parameters are [Fe/H] = -3.05 ± 0.17, Teff = 4477 K, Vt = 2.70 kms-1 , and log(g) = 0.70, indicating that HE 2324-0215 is a red giant star. The [Eu/Fe] = 0.73 and [Ba/Eu] = -0.68 suggests that this is an r-I star. Since thorium is detectable in this star, we derived the age of the star by the means of radioactive decay, resulting in the age of 13.0 ± 1.0 Gyr. The age and the metallicity of the star suggest that HE 2324-0215 formed in a dwarf galaxy which was later accreted and became part of the Milky Way."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.B."]},{"key":"dc:title","label":"Title","values":["Chemical abundance analysis of HE 2324-0215, an r-process-enhanced metal-poor star"]}]}],"canonical_facts":{"dc:contributor.advisor":["Anna Frebel."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Physics."],"dc:contributor.other":["Massachusetts Institute of Technology. Department of Physics."],"dc:creator":["Thanathibodee, Thanawuth"],"dc:date.accessioned":["2016-12-05T19:56:16Z"],"dc:date.available":["2016-12-05T19:56:16Z"],"dc:date.issued":["2016"],"dc:description":["Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2016.","Cataloged from PDF version of thesis.","Includes bibliographical references (pages 35-36)."],"dc:description.abstract":["We report the abundance analysis of the metal-poor halo star HE 2324-0215 for 22 neutron-capture elements and 14 light elements with Z < 30. The stellar parameters are [Fe/H] = -3.05 ± 0.17, Teff = 4477 K, Vt = 2.70 kms-1 , and log(g) = 0.70, indicating that HE 2324-0215 is a red giant star. The [Eu/Fe] = 0.73 and [Ba/Eu] = -0.68 suggests that this is an r-I star. Since thorium is detectable in this star, we derived the age of the star by the means of radioactive decay, resulting in the age of 13.0 ± 1.0 Gyr. The age and the metallicity of the star suggest that HE 2324-0215 formed in a dwarf galaxy which was later accreted and became part of the Milky Way."],"dc:description.degree":["S.B."],"dc:identifier.uri":["http://hdl.handle.net/1721.1/105644"],"dc:language.iso":["eng"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"dc:rights.uri":["http://dspace.mit.edu/handle/1721.1/7582"],"dc:subject":["Physics."],"dc:title":["Chemical abundance analysis of HE 2324-0215, an r-process-enhanced metal-poor star"],"dc:type":["Thesis"]},"updated_at":"2026-07-22T22:22:19Z"}