2004/08/09 by Nimish P. Hathi, Hathi, Nimish P.
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0408135
Master's Thesis (UQ, Brisbane, 1997). 57 pages, 7 figures
arxiv created 2004/08/09 · openalex publication_date 2004/08/09 · arxiv updated 2009/12/01 · openalex created_date 2022/10/06 · openalex updated_date 2026/07/28
Using the theory of collisional line broadening developed by Anstee and\nO'Mara (1991, 1995) and the spectrum synthesis software developed by John Ross,\nthe abundances of Fe, Mg, Ca and Na in Alpha Centauri A are determined from\nstrong lines. The abundances are approximately 0.2 dex higher than in the Sun.\nThe derived abundances are independent of non-thermal motions in the atmosphere\nof Alpha Centauri A.\n The microturbulence obtained from medium-strong lines using the abundances\nobtained from the strong lines is 1.34 +/- 0.12 km/s, i.e., 0.20 km/s larger\nthan in the Sun, which is fully consistent with the lower surface gravity of\nAlpha Centauri A. This microturbulence can then be used in determination of the\nabundance of other elements for which there are no strong lines in the\nspectrum.\n This thesis is the first application of this theory to determine abundances\nand the microturbulence of Alpha Centauri A. Recent results are published by\nDoyle et al.(astro-ph/0407468)\n