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Astrophysics > Astrophysics of Galaxies

arXiv:1410.3475 (astro-ph)
[Submitted on 13 Oct 2014]

Title:[$α$/Fe] Abundances of Four Outer M 31 Halo Stars

Authors:Luis C. Vargas (1), Karoline M. Gilbert (2), Marla C. Geha (1), Erik J. Tollerud (1), Evan N. Kirby (3), Puragra Guhathakurta (4) ((1) Yale University, (2) STSCI, (3) Caltech, (4) UC Santa Cruz)
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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].
Comments: 6 pages, 5 figures, resubmitted to ApJ Letters after referee report
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:1410.3475 [astro-ph.GA]
  (or arXiv:1410.3475v1 [astro-ph.GA] for this version)
  https://doi.org/10.48550/arXiv.1410.3475
Related DOI: https://doi.org/10.1088/2041-8205/797/1/L2

Submission history

From: Luis C Vargas [view email]
[v1] Mon, 13 Oct 2014 20:00:05 UTC (120 KB)
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