Galactic paleontology Comparison of the chemical abundances in Halo and Sculptor stars

Wildering, Jorn, (2021) Galactic paleontology Comparison of the chemical abundances in Halo and Sculptor stars. Bachelor's Thesis, Astronomy.

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Abstract

Galactic paleontology studies old Metal Poor (MP), and Extremely Metal Poor (EMP) stars to place constraints on the processes of the early universe. MP stars that we can identify spectra for are found in the Milky way Halo, and some dwarf galaxies; notably the Sculptor dSph Galaxy. We compare findings on MP and EMP stars in the Sculptor dSph Galaxy from Chiti et al. (2018) with results from Skúladóttir et al. (2015) and Hill et al. (2019). We aim to check the 36% Carbon Enhanced Metal Poor (CEMP) fraction for stars [Fe/H] < -3 stated by Chiti et al. We perform a sky coordinate match between the Chiti et al. and Hill et al. data sets, and the Chiti et al. and Skúladóttir data sets. We then used the matched stars to compare [C/Fe] and [Fe/H] values. Finally, we plot the Chiti et al. data with the Skúladóttir et al. data in a so called Aoki diagram (from Aoki et al. 2007) to determine the CEMP fraction. We find 12 match stars between Chiti et al. and Hill et al., and 8 match stars between Chiti et al. and Skúladóttir et al.. These seem to indicate lower [Fe/H] and higher [C/Fe] values for the Chiti et al. data sets, though the error margins are substantial. From our Aoki diagrams, we find 1 CEMP star candidate in the Chiti et al. sample of 100 stars. These results indicate that the [C/Fe] and the CEMP stars in Sculptor dSph are different to what is found in Halo stars.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Tolstoy, E.
Degree programme:	Astronomy
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	14 Jul 2021 12:33
Last Modified:	14 Jul 2021 12:33
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/25221

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