A detailed study of giants and horizontal branch stars in M68 : atmospheric parameters and chemical abundances

dc.contributor.advisorSneden, Christopheren
dc.contributor.advisorRobinson, Edwarden
dc.creatorSchaeuble, Marc-Andreen
dc.date.accessioned2016-06-23T19:03:55Z
dc.date.available2016-06-23T19:03:55Z
dc.date.issued2015-05en
dc.date.submittedMay 2015
dc.date.updated2016-06-23T19:03:55Z
dc.description.abstractIn this thesis, I present a detailed high-resolution spectroscopic study of post main sequence stars in the Globular Cluster M68. My sample, which covers a range of 4000 K in Teff, and 3.5 dex in log(g), is comprised of members from the red giant, red horizontal, and blue horizontal branch, making this the first high-resolution globular cluster study covering such a large evolutionary and parameter space. Initially, atmospheric parameters were determined using photometric as well as spectroscopic methods, both of which resulted in unphysical and unexpected Teff, log(g), vt, and [Fe/H] combinations. I therefore developed a hybrid approach that addresses most of these problems, and yields atmospheric parameters that agree well with other measurements in the literature. Furthermore, my derived stellar metallicities are consistent across all evolutionary stages, with <[Fe/H]> = 2.42 ( sigma = 0.14) from 25 stars. Chemical abundances obtained using my methodology also agree with previous studies and bear all the hallmarks of globular clusters, such as a Na-O anti-correlation, constant Ca abundances, and mild r-process enrichment.en
dc.description.departmentAstronomyen
dc.format.mimetypeapplication/pdfen
dc.identifierdoi:10.15781/T2BC3SX2Pen
dc.identifier.urihttp://hdl.handle.net/2152/38655en
dc.language.isoenen
dc.subjectStellar evolutionen
dc.subjectChemical evolutionen
dc.titleA detailed study of giants and horizontal branch stars in M68 : atmospheric parameters and chemical abundancesen
dc.typeThesisen
dc.type.materialtexten
thesis.degree.departmentAstronomyen
thesis.degree.disciplineAstronomyen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Artsen

Access full-text files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
SCHAEUBLE-THESIS-2015.pdf
Size:
1.61 MB
Format:
Adobe Portable Document Format

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
LICENSE.txt
Size:
1.84 KB
Format:
Plain Text
Description: