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Disentangling the Hercules stream

Bensby, T. LU orcid ; Oey, M. S. ; Feltzing, S. LU orcid and Gustafsson, B. (2007) In Astrophysical Journal 655(2). p.89-92
Abstract
Using high-resolution spectra of nearby F and G dwarf stars, we have investigated the detailed abundance and age structure of the Hercules stream. We find that the stars in the stream have a wide range of stellar ages, metallicities, and element abundances. By comparing to existing samples of stars in the solar neighborhood with kinematics typical of the Galactic thin and thick disks, we find that the properties of the Hercules stream distinctly separate into the abundance and age trends of the two disks. Hence, we find it unlikely that the Hercules stream is a unique Galactic stellar population but rather is a mixture of thin and thick disk stars. This points toward a dynamical origin for the Hercules stream, probably caused by the... (More)
Using high-resolution spectra of nearby F and G dwarf stars, we have investigated the detailed abundance and age structure of the Hercules stream. We find that the stars in the stream have a wide range of stellar ages, metallicities, and element abundances. By comparing to existing samples of stars in the solar neighborhood with kinematics typical of the Galactic thin and thick disks, we find that the properties of the Hercules stream distinctly separate into the abundance and age trends of the two disks. Hence, we find it unlikely that the Hercules stream is a unique Galactic stellar population but rather is a mixture of thin and thick disk stars. This points toward a dynamical origin for the Hercules stream, probably caused by the Galactic bar. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stars : abundances, neighborhood, solar, Galaxy : formation, galaxy : disk, Galaxy : evolution, stars : kinematics
in
Astrophysical Journal
volume
655
issue
2
pages
89 - 92
publisher
American Astronomical Society
external identifiers
  • wos:000243726100007
  • scopus:33847176588
ISSN
0004-637X
language
English
LU publication?
yes
id
dbada8b6-fdd2-4bd6-9916-21b26b984974 (old id 676439)
alternative location
http://arxiv.org/PS_cache/astro-ph/pdf/0612/0612658v1.pdf
date added to LUP
2016-04-01 16:03:01
date last changed
2024-01-11 00:27:42
@article{dbada8b6-fdd2-4bd6-9916-21b26b984974,
  abstract     = {{Using high-resolution spectra of nearby F and G dwarf stars, we have investigated the detailed abundance and age structure of the Hercules stream. We find that the stars in the stream have a wide range of stellar ages, metallicities, and element abundances. By comparing to existing samples of stars in the solar neighborhood with kinematics typical of the Galactic thin and thick disks, we find that the properties of the Hercules stream distinctly separate into the abundance and age trends of the two disks. Hence, we find it unlikely that the Hercules stream is a unique Galactic stellar population but rather is a mixture of thin and thick disk stars. This points toward a dynamical origin for the Hercules stream, probably caused by the Galactic bar.}},
  author       = {{Bensby, T. and Oey, M. S. and Feltzing, S. and Gustafsson, B.}},
  issn         = {{0004-637X}},
  keywords     = {{stars : abundances; neighborhood; solar; Galaxy : formation; galaxy : disk; Galaxy : evolution; stars : kinematics}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{89--92}},
  publisher    = {{American Astronomical Society}},
  series       = {{Astrophysical Journal}},
  title        = {{Disentangling the Hercules stream}},
  url          = {{http://arxiv.org/PS_cache/astro-ph/pdf/0612/0612658v1.pdf}},
  volume       = {{655}},
  year         = {{2007}},
}