Spectroscopic analysis of stars in the outskirts of NGC 1851

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dc.contributor.advisor Henault-Brunet, Vincent
dc.creator Surdha, Tashveena Rani
dc.date.accessioned 2021-06-10T15:46:03Z
dc.date.available 2021-06-10T15:46:03Z
dc.date.issued 2021
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/29568
dc.description 1 online resource (vi, 38 pages) : colour illustrations
dc.description Includes abstract.
dc.description Includes bibliographical references (page 38).
dc.description.abstract NGC 1851 is a peculiar globular cluster with hints of a bimodal populations of stars (possibly two different episodes of formation of stars that resulted in a small spread in the metallicity in the centre of the cluster). It is suggested that it might have been part of a progenitor dwarf galaxy. Spectroscopic analysis of stars in the outskirts of this cluster can indicate its origin by looking at the metallicity distribution. The stars closer to the core of the cluster have a metallicity of [Fe/H]=-1.18 ± 0.2 and the stars studied here are cluster members of NGC 1851 which are obtained based on Gaia DR2 parallaxes and proper motions and for which we have spectroscopic data from the FLAMES instrument on the Very Large Telescope covering a bigger area of the cluster, all the way to the Jacobi radius. The calcium infrared triplet lines, which are strong absorption lines in the range of 8400 Å to 9000 Å are investigated by looking at their equivalent width. The equivalent width, which is related to the metallicity of a star, is studied for 89 stars which are located in the outer regions of the cluster. Indication of a small spread in [Fe/H] is found which might suggest that the cluster has not been part of a progenitor dwarf galaxy. en_CA
dc.description.provenance Submitted by Greg Hilliard (greg.hilliard@smu.ca) on 2021-06-10T15:46:03Z No. of bitstreams: 1 Surdha_Tashveena_Honours_2021.pdf: 955220 bytes, checksum: cf8923b45acfff91f59c3f8b7082ed7c (MD5) en
dc.description.provenance Made available in DSpace on 2021-06-10T15:46:03Z (GMT). No. of bitstreams: 1 Surdha_Tashveena_Honours_2021.pdf: 955220 bytes, checksum: cf8923b45acfff91f59c3f8b7082ed7c (MD5) Previous issue date: 2021-05-11 en
dc.language.iso en en_CA
dc.publisher Halifax, N.S. : Saint Mary's University
dc.title Spectroscopic analysis of stars in the outskirts of NGC 1851 en_CA
dc.type Text en_CA
thesis.degree.name Bachelor of Science (Honours Astrophysics)
thesis.degree.level Undergraduate
thesis.degree.discipline Astronomy and Physics
thesis.degree.grantor Saint Mary's University (Halifax, N.S.)
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