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Abundance Trends in the Inner and Outer Galactic Disk

Bensby, Thomas LU ; Alves-Brito, A.; Oey, M. S.; Yong, D. and Melendez, J. (2012) Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way In Galactic archeology, near-field cosmology and the formation of the Milky Way (ASP Conference Series) 458. p.171-174
Abstract
Based on high-resolution spectra obtained with the MIKE spectrograph on the Magellan telescopes we present detailed elemental abundances for 64 red giant stars in the inner and outer Galactic disk. For the inner disk sample (4-7 kpc from the Galactic centre) we find that stars with both thin and thick disk abundance patterns are present while for Galactocentric distances beyond 10 kpc, we only find chemical patterns associated with the local thin disk, even for stars far above the Galactic plane. Our results show that the relative densities of the thick and thin disks are dramatically different from the solar neighbourhood, and we therefore suggest that the radial scale length of the thick disk is much shorter than that of the thin disk. A... (More)
Based on high-resolution spectra obtained with the MIKE spectrograph on the Magellan telescopes we present detailed elemental abundances for 64 red giant stars in the inner and outer Galactic disk. For the inner disk sample (4-7 kpc from the Galactic centre) we find that stars with both thin and thick disk abundance patterns are present while for Galactocentric distances beyond 10 kpc, we only find chemical patterns associated with the local thin disk, even for stars far above the Galactic plane. Our results show that the relative densities of the thick and thin disks are dramatically different from the solar neighbourhood, and we therefore suggest that the radial scale length of the thick disk is much shorter than that of the thin disk. A thick disk scale-length of L-thick = 2.0 kpc, and L-thin = 3.8 kpc for the thin disk, better match the data. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Galactic archeology, near-field cosmology and the formation of the Milky Way (ASP Conference Series)
volume
458
pages
171 - 174
publisher
Astronomical Society of the Pacific
conference name
Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way
external identifiers
  • wos:000309700000047
language
English
LU publication?
yes
id
f3f073e8-8f2f-4479-9a29-6d129465718c (old id 3287958)
alternative location
http://arxiv.org/abs/1201.2009
date added to LUP
2012-12-20 08:49:11
date last changed
2016-04-16 08:39:49
@inproceedings{f3f073e8-8f2f-4479-9a29-6d129465718c,
  abstract     = {Based on high-resolution spectra obtained with the MIKE spectrograph on the Magellan telescopes we present detailed elemental abundances for 64 red giant stars in the inner and outer Galactic disk. For the inner disk sample (4-7 kpc from the Galactic centre) we find that stars with both thin and thick disk abundance patterns are present while for Galactocentric distances beyond 10 kpc, we only find chemical patterns associated with the local thin disk, even for stars far above the Galactic plane. Our results show that the relative densities of the thick and thin disks are dramatically different from the solar neighbourhood, and we therefore suggest that the radial scale length of the thick disk is much shorter than that of the thin disk. A thick disk scale-length of L-thick = 2.0 kpc, and L-thin = 3.8 kpc for the thin disk, better match the data.},
  author       = {Bensby, Thomas and Alves-Brito, A. and Oey, M. S. and Yong, D. and Melendez, J.},
  booktitle    = {Galactic archeology, near-field cosmology and the formation of the Milky Way (ASP Conference Series)},
  language     = {eng},
  pages        = {171--174},
  publisher    = {Astronomical Society of the Pacific},
  title        = {Abundance Trends in the Inner and Outer Galactic Disk},
  volume       = {458},
  year         = {2012},
}