2026-09-19T10:34:04Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1056442022-01-13T07:54:07Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Anna Frebel.
Thanathibodee, Thanawuth
Massachusetts Institute of Technology. Department of Physics.
Massachusetts Institute of Technology. Department of Physics
2016-12-05T19:56:16Z
2016-12-05T19:56:16Z
2016
2016
http://hdl.handle.net/1721.1/105644
963844011
Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 35-36).
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.
by Thanawuth Thanathibodee.
S.B.
36 pages
eng
Massachusetts Institute of Technology
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.
http://dspace.mit.edu/handle/1721.1/7582
Physics.
Chemical abundance analysis of HE 2324-0215, an r-process-enhanced metal-poor star
Thesis
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<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>
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