Chemical analysis of ancient relicts in the Milky Way disk

E. Stonkuté; R. Zenoviené; G. Tautvaisiené; Birgitta Nordström

Chemical analysis of ancient relicts in the Milky Way disk

E. Stonkuté, R. Zenoviené, G. Tautvaisiené, Birgitta Nordström

Astrophysics and Planetary Science

Abstract

We present detailed analysis of two groups of F- and G- type stars originally found to have similarities in their orbital parameters. The distinct kinematic properties suggest that they might originate from ancient accretion events in the Milky Way. From high resolution spectra taken with the spectrograph FIES at the Nordic Optical Telescope, La Palma, we determined abundances of oxygen, alpha- and r-process elements. Our results indicate that the sample of investigated stars is chemically homogeneous and the abundances of oxygen, alpha and r-process elements are overabundant in comparison with Galactic disk dwarfs. This provides the additional evidence that those stellar groups had the common formation and possible origin from disrupted satellites.

Original language	English
Journal	E P J Web of Conferences
Volume	19
Pages (from-to)	05007
ISSN	2100-014X
Publication status	Published - 7 Feb 2012

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http://dx.doi.org/10.1051/epjconf/20121905007

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title = "Chemical analysis of ancient relicts in the Milky Way disk",

abstract = "We present detailed analysis of two groups of F- and G- type stars originally found to have similarities in their orbital parameters. The distinct kinematic properties suggest that they might originate from ancient accretion events in the Milky Way. From high resolution spectra taken with the spectrograph FIES at the Nordic Optical Telescope, La Palma, we determined abundances of oxygen, alpha- and r-process elements. Our results indicate that the sample of investigated stars is chemically homogeneous and the abundances of oxygen, alpha and r-process elements are overabundant in comparison with Galactic disk dwarfs. This provides the additional evidence that those stellar groups had the common formation and possible origin from disrupted satellites.",

author = "E. Stonkut{\'e} and R. Zenovien{\'e} and G. Tautvaisien{\'e} and Birgitta Nordstr{\"o}m",

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language = "English",

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pages = "05007",

journal = "E P J Web of Conferences",

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T1 - Chemical analysis of ancient relicts in the Milky Way disk

AU - Stonkuté, E.

AU - Zenoviené, R.

AU - Tautvaisiené, G.

AU - Nordström, Birgitta

PY - 2012/2/7

Y1 - 2012/2/7

N2 - We present detailed analysis of two groups of F- and G- type stars originally found to have similarities in their orbital parameters. The distinct kinematic properties suggest that they might originate from ancient accretion events in the Milky Way. From high resolution spectra taken with the spectrograph FIES at the Nordic Optical Telescope, La Palma, we determined abundances of oxygen, alpha- and r-process elements. Our results indicate that the sample of investigated stars is chemically homogeneous and the abundances of oxygen, alpha and r-process elements are overabundant in comparison with Galactic disk dwarfs. This provides the additional evidence that those stellar groups had the common formation and possible origin from disrupted satellites.

AB - We present detailed analysis of two groups of F- and G- type stars originally found to have similarities in their orbital parameters. The distinct kinematic properties suggest that they might originate from ancient accretion events in the Milky Way. From high resolution spectra taken with the spectrograph FIES at the Nordic Optical Telescope, La Palma, we determined abundances of oxygen, alpha- and r-process elements. Our results indicate that the sample of investigated stars is chemically homogeneous and the abundances of oxygen, alpha and r-process elements are overabundant in comparison with Galactic disk dwarfs. This provides the additional evidence that those stellar groups had the common formation and possible origin from disrupted satellites.

M3 - Conference article

SN - 2100-014X

VL - 19

SP - 05007

JO - E P J Web of Conferences

JF - E P J Web of Conferences

ER -

Chemical analysis of ancient relicts in the Milky Way disk

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