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The Gaia-ESO Survey: α-abundances of metal-poor stars

Jackson-Jones, R, Jofré, P, Hawkins, K, Hourihane, A, Gilmore, G, Kordopatis, G, Worley, C, Randich, S, Vallenari, A, Bensby, T, Bragaglia, A, Flaccomio, E, Korn, AJ, Recio-Blanco, A, Smiljanic, R, Costado, MT, Heiter, U, Hill, V, Lardo, C, Laverny, PD , Guiglion, G, Mikolaitis, S, Zaggia, S and Tautvaišiene, G (2014) The Gaia-ESO Survey: α-abundances of metal-poor stars. Astronomy & Astrophysics.

1410.6415v1.pdf - Accepted Version

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We performed a detailed study of the ratio of low-{\alpha} to high-{\alpha} stars in the Galactic halo as observed by the Gaia-ESO Survey. Using a sample of 381 metal-poor stars from the second internal data release, we found that the value of this ratio did not show evidence of systematic trends as a function of metallicity, surface gravity, Galactic latitude, Galactic longitude, height above the Galactic plane, and Galactocentric radius. We conclude that the {\alpha}-poor/{\alpha}-rich value of 0.28 $\pm$ 0.08 suggests that in the inner halo, the larger portion of stars were formed in a high star formation rate environment, and about 15% of the metal-poor stars originated from much lower star formation rate environments.

Item Type: Article
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
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Date Deposited: 21 Nov 2014 15:11
Last Modified: 04 Sep 2021 14:47
URI: https://researchonline.ljmu.ac.uk/id/eprint/203
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