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A Differential Study of Nucleosynthesis in Open Star Clusters

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Item Summary

Title:A Differential Study of Nucleosynthesis in Open Star Clusters
Authors:Lum, Michael Gavin
Contributors:Boesgaard, Ann M. (advisor)
Astronomy (department)
Artificial intelligence
Machine Learning
show 2 moreSpectroscopy
Star Clusters
show less
Date Issued:Dec 2018
Publisher:University of Hawaiʻi at Mānoa
Abstract:Measuring the chemical composition of stars in open clusters provides the best information
on the origin and evolution of these stars and clusters. When we compare compositions of
the main sequence stars with those of the evolved (giant) stars in the same cluster, we can
measure the results of hundreds of millions of years of fusion processes in the cores of these
This work presents an extensive elemental catalog of 24 individual elements, 7 in multiple
ionization states, measured from high-resolution spectra (R > 40, 000) of 230 stars in 8 open
star clusters. We perform a differential analysis between the main sequence and giant stars
to measure elemental evolution from core nucleosynthesis. Using the main sequence turn off
age of each cluster, we also analyze the temporal/mass effects on the elemental evolution.
We also present rudimentary artificial intelligence and machine learning techniques used to
analyze the spectra, determine cluster membership, and derive stellar atmospheric parameters and elemental abundances
Description:Ph.D. Thesis. University of Hawaiʻi at Mānoa 2018.
Pages/Duration:132 pages
Rights:All UHM dissertations and 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 from the copyright owner.
Appears in Collections: Ph.D. - Astronomy

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