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

R. Jackson-Jones; P. Jofre; K. Hawkins; A. Hourihane; G. Gilmore; G. Kordopatis; C. Worley; S. Randich; A. Vallenari; Thomas Bensby; A. Bragaglia; E. Flaccomio; A. J. Korn; A. Recio-Blanco; R. Smiljanic; M. T. Costado; U. Heiter; V. Hill; C. Lardo; P. de Laverny; G. Guiglion; S. Mikolaitis; S. Zaggia; G. Tautvaisiene

doi:10.1051/0004-6361/201425099

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

R. Jackson-Jones, P. Jofre, K. Hawkins, A. Hourihane, G. Gilmore, G. Kordopatis, C. Worley, S. Randich, A. Vallenari, Thomas Bensby, A. Bragaglia, E. Flaccomio, A. J. Korn, A. Recio-Blanco, R. Smiljanic, M. T. Costado, U. Heiter, V. Hill, C. Lardo, P. de LavernyG. Guiglion, S. Mikolaitis, S. Zaggia, G. Tautvaisiene

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Sammanfattning

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.

Originalspråk	engelska
Artikelnummer	L5
Tidskrift	Astronomy & Astrophysics
Volym	571
DOI	https://doi.org/10.1051/0004-6361/201425099
Status	Published - 2014

Ämnesklassifikation (UKÄ)

Astronomi, astrofysik och kosmologi

Tillgång till dokument

10.1051/0004-6361/201425099

Gaia-ESO Survey
Gilmore, G., Randich, S., Feltzing, S., Bensby, T., Howes, L., Gruyters, P., Ryde, N., Stonkute, E. & Ruchti, G.
2012/12/24 → 2022/07/01
Projekt: Forskning

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Jackson-Jones, R., Jofre, P., Hawkins, K., Hourihane, A., Gilmore, G., Kordopatis, G., Worley, C., Randich, S., Vallenari, A., Bensby, T., Bragaglia, A., Flaccomio, E., Korn, A. J., Recio-Blanco, A., Smiljanic, R., Costado, M. T., Heiter, U., Hill, V., Lardo, C., ... Tautvaisiene, G. (2014). The Gaia-ESO Survey: alpha-abundances of metal-poor stars. Astronomy & Astrophysics, 571, [L5]. https://doi.org/10.1051/0004-6361/201425099

@article{4745727007bb4c179760b2f6a2ec9db4,

title = "The Gaia-ESO Survey: alpha-abundances of metal-poor stars",

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.",

keywords = "stars: abundances, Galaxy: halo",

author = "R. Jackson-Jones and P. Jofre and K. Hawkins and A. Hourihane and G. Gilmore and G. Kordopatis and C. Worley and S. Randich and A. Vallenari and Thomas Bensby and A. Bragaglia and E. Flaccomio and Korn, {A. J.} and A. Recio-Blanco and R. Smiljanic and Costado, {M. T.} and U. Heiter and V. Hill and C. Lardo and {de Laverny}, P. and G. Guiglion and S. Mikolaitis and S. Zaggia and G. Tautvaisiene",

year = "2014",

doi = "10.1051/0004-6361/201425099",

language = "English",

volume = "571",

journal = "Astronomy & Astrophysics",

issn = "1432-0746",

publisher = "EDP Sciences",

}

Jackson-Jones, R, Jofre, 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, de Laverny, P, Guiglion, G, Mikolaitis, S, Zaggia, S & Tautvaisiene, G 2014, 'The Gaia-ESO Survey: alpha-abundances of metal-poor stars', Astronomy & Astrophysics, vol. 571, L5. https://doi.org/10.1051/0004-6361/201425099

TY - JOUR

T1 - The Gaia-ESO Survey: alpha-abundances of metal-poor stars

AU - Jackson-Jones, R.

AU - Jofre, P.

AU - Hawkins, K.

AU - Hourihane, A.

AU - Gilmore, G.

AU - Kordopatis, G.

AU - Worley, C.

AU - Randich, S.

AU - Vallenari, A.

AU - Bensby, Thomas

AU - Bragaglia, A.

AU - Flaccomio, E.

AU - Korn, A. J.

AU - Recio-Blanco, A.

AU - Smiljanic, R.

AU - Costado, M. T.

AU - Heiter, U.

AU - Hill, V.

AU - Lardo, C.

AU - de Laverny, P.

AU - Guiglion, G.

AU - Mikolaitis, S.

AU - Zaggia, S.

AU - Tautvaisiene, G.

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - stars: abundances

KW - Galaxy: halo

U2 - 10.1051/0004-6361/201425099

DO - 10.1051/0004-6361/201425099

M3 - Article

SN - 1432-0746

VL - 571

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - L5

ER -

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

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Ämnesklassifikation (UKÄ)

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Projekt

Gaia-ESO Survey

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