The Gaia-ESO Survey: alpha-abundances of metal-poor stars
Jackson-Jones, R. ; Jofre, P. ; Hawkins, K. ; Hourihane, A. ; Gilmore, G. ; Kordopatis, G. ; Worley, C. ; Randich, S. ; Vallenari, A. and Bensby, Thomas LU
, et al.
(2014)
In Astronomy & Astrophysics
571.
- Abstract
- 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.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5069054
- author
- Jackson-Jones, R.
; Jofre, P.
; Hawkins, K.
; Hourihane, A.
; Gilmore, G.
; Kordopatis, G.
; Worley, C.
; Randich, S.
; Vallenari, A.
and Bensby, Thomas
LU
, et al. (More)
- Jackson-Jones, R.
; Jofre, P.
; Hawkins, K.
; Hourihane, A.
; Gilmore, G.
; Kordopatis, G.
; Worley, C.
; Randich, S.
; Vallenari, A.
; Bensby, Thomas
LU
; Bragaglia, A.
; Flaccomio, E.
; Korn, A. J.
; Recio-Blanco, A.
; Smiljanic, R.
; Costado, M. T.
; Heiter, U.
; Hill, V.
; Lardo, C.
; de Laverny, P.
; Guiglion, G.
; Mikolaitis, S.
; Zaggia, S.
and Tautvaisiene, G.
(Less)
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- stars: abundances, Galaxy: halo
- in
- Astronomy & Astrophysics
- volume
- 571
- article number
- L5
- publisher
- EDP Sciences
- external identifiers
-
- wos:000345282600103
- scopus:84910681473
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/201425099
- project
- Gaia-ESO Survey
- language
- English
- LU publication?
- yes
- id
- 47457270-07bb-4c17-9760-b2f6a2ec9db4 (old id 5069054)
- date added to LUP
- 2016-04-01 14:32:34
- date last changed
- 2022-12-12 00:21:38
@article{47457270-07bb-4c17-9760-b2f6a2ec9db4,
abstract = {{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.}},
author = {{Jackson-Jones, R. and Jofre, P. and Hawkins, K. and Hourihane, A. and Gilmore, G. and Kordopatis, G. and Worley, C. and Randich, S. and Vallenari, A. and Bensby, Thomas and Bragaglia, A. and Flaccomio, E. and Korn, A. J. and Recio-Blanco, A. and Smiljanic, R. and Costado, M. T. and Heiter, U. and Hill, V. and Lardo, C. and de Laverny, P. and Guiglion, G. and Mikolaitis, S. and Zaggia, S. and Tautvaisiene, G.}},
issn = {{0004-6361}},
keywords = {{stars: abundances; Galaxy: halo}},
language = {{eng}},
publisher = {{EDP Sciences}},
series = {{Astronomy & Astrophysics}},
title = {{The Gaia-ESO Survey: alpha-abundances of metal-poor stars}},
url = {{http://dx.doi.org/10.1051/0004-6361/201425099}},
doi = {{10.1051/0004-6361/201425099}},
volume = {{571}},
year = {{2014}},
}