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Manganese Abundances in Cluster and Field Stars

Sobeck, Jennifer; Ivans, Inese; Simmerer, Jennifer LU ; Sneden, Christopher; Hoeflich, Peter; Fulbright, Jon and Kraft, Robert (2006) In Astronomical Journal 131(6). p.2949-2958
Abstract
We have derived Mn abundances for more than 200 stars in 19 globular clusters. In addition, Mn abundance determinations have been made for a comparable number of halo field and disk stars possessing an overlapping range of metallicities and stellar parameters. Our primary data set was comprised of high-resolution spectra previously acquired at the McDonald, Lick, and Keck Observatories. To enlarge our data pool, we acquired globular and open cluster spectra from several other investigators. Data were analyzed using synthetic spectra of the 6000 Å Mn I triplet. Hyperfine structure parameters were included in the synthetic spectra computations. Our analysis shows that for the metallicity range -0.7>[Fe/H]>-2.7, stars of 19 globular... (More)
We have derived Mn abundances for more than 200 stars in 19 globular clusters. In addition, Mn abundance determinations have been made for a comparable number of halo field and disk stars possessing an overlapping range of metallicities and stellar parameters. Our primary data set was comprised of high-resolution spectra previously acquired at the McDonald, Lick, and Keck Observatories. To enlarge our data pool, we acquired globular and open cluster spectra from several other investigators. Data were analyzed using synthetic spectra of the 6000 Å Mn I triplet. Hyperfine structure parameters were included in the synthetic spectra computations. Our analysis shows that for the metallicity range -0.7>[Fe/H]>-2.7, stars of 19 globular clusters have a mean relative abundance of <[Mn/Fe]>=-0.37+/-0.01 (σ=0.10), a value in agreement with that of the field stars, <[Mn/Fe]>=-0.36+/-0.01 (σ=0.08). Despite the 2 orders of magnitude span in metallicity, the <[Mn/Fe]> ratio remains constant in both stellar populations. Our Mn abundance data indicate that there is no appreciable variation in the relative nucleosynthetic contribution from massive stars that undergo core-collapse supernovae and thus no significant change of the associated initial mass function in the specified metallicity range. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Astronomical Journal
volume
131
issue
6
pages
2949 - 2958
publisher
The American Astronomical Society
external identifiers
  • Scopus:33746853814
ISSN
1538-3881
language
English
LU publication?
no
id
cdd5ccdf-2255-41d6-a1bc-8bc90cfad48a (old id 964804)
date added to LUP
2008-01-29 11:14:32
date last changed
2016-11-15 10:58:10
@misc{cdd5ccdf-2255-41d6-a1bc-8bc90cfad48a,
  abstract     = {We have derived Mn abundances for more than 200 stars in 19 globular clusters. In addition, Mn abundance determinations have been made for a comparable number of halo field and disk stars possessing an overlapping range of metallicities and stellar parameters. Our primary data set was comprised of high-resolution spectra previously acquired at the McDonald, Lick, and Keck Observatories. To enlarge our data pool, we acquired globular and open cluster spectra from several other investigators. Data were analyzed using synthetic spectra of the 6000 Å Mn I triplet. Hyperfine structure parameters were included in the synthetic spectra computations. Our analysis shows that for the metallicity range -0.7&gt;[Fe/H]&gt;-2.7, stars of 19 globular clusters have a mean relative abundance of &lt;[Mn/Fe]&gt;=-0.37+/-0.01 (σ=0.10), a value in agreement with that of the field stars, &lt;[Mn/Fe]&gt;=-0.36+/-0.01 (σ=0.08). Despite the 2 orders of magnitude span in metallicity, the &lt;[Mn/Fe]&gt; ratio remains constant in both stellar populations. Our Mn abundance data indicate that there is no appreciable variation in the relative nucleosynthetic contribution from massive stars that undergo core-collapse supernovae and thus no significant change of the associated initial mass function in the specified metallicity range.},
  author       = {Sobeck, Jennifer and Ivans, Inese and Simmerer, Jennifer and Sneden, Christopher and Hoeflich, Peter and Fulbright, Jon and Kraft, Robert},
  issn         = {1538-3881},
  language     = {eng},
  number       = {6},
  pages        = {2949--2958},
  publisher    = {ARRAY(0xb3655a0)},
  series       = {Astronomical Journal},
  title        = {Manganese Abundances in Cluster and Field Stars},
  volume       = {131},
  year         = {2006},
}