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23 April 2024 |
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[$alpha$/Fe] Abundances of Four Outer M 31 Halo Stars | | Luis C. Vargas
; Karoline M. Gilbert
; Marla C. Geha
; Erik J. Tollerud
; Evan N. Kirby
; Puragra Guhathakurta
; | | Date: |
13 Oct 2014 | | Abstract: | We present alpha element to iron abundance ratios, [$alpha$/Fe], for four
stars in the outer stellar halo of the Andromeda Galaxy (M 31). The stars were
identified as high-likelihood field halo stars by Gilbert et al. (2012) and lie
at projected distances between 70 and 140 kpc from M 31’s center. These are the
first alpha abundances measured for a halo star in a galaxy beyond the Milky
Way. The stars range in metallicity between [Fe/H]= -2.2 and [Fe/H]= -1.4. The
sample’s average [$alpha$/Fe] ratio is +0.20+/-0.20. The best-fit average
value is elevated above solar which is consistent with rapid chemical
enrichment from Type II supernovae. The mean [$alpha$/Fe] ratio of our M31
outer halo sample agrees (within the uncertainties) with that of Milky Way
inner/outer halo stars that have a comparable range of [Fe/H]. | | Source: | arXiv, 1410.3475 | | Services: | Forum | Review | PDF | Favorites | |
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