uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
The Gaia-ESO Survey: alpha-abundances of metal-poor stars
Show others and affiliations
2014 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 571, L5- p.Article in journal (Refereed) Published
Abstract [en]

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 +/- 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.

Place, publisher, year, edition, pages
2014. Vol. 571, L5- p.
Keyword [en]
stars: abundances, Galaxy: halo
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-245557DOI: 10.1051/0004-6361/201425099ISI: 000345282600103OAI: oai:DiVA.org:uu-245557DiVA: diva2:791413
Available from: 2015-02-27 Created: 2015-02-26 Last updated: 2015-02-27Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Korn, Andreas J.
By organisation
Theoretical Astrophysics
In the same journal
Astronomy and Astrophysics
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 513 hits
ReferencesLink to record
Permanent link

Direct link