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Manganese trends in a sample of thin and thick disk stars - The origin of Mn

Feltzing, Sofia LU ; Fohlman, M. and Bensby, Thomas (2007) In Astronomy & Astrophysics 467(2). p.665-677
Abstract
Context. Manganese is an iron-peak element and although the nucleosynthesis path that leads to its formation is fairly well understood, it remains unclear which objects, SN II and/or SN Ia, that contribute the majority of Mn to the interstellar medium. It also remains unclear to which extent the supernovae Mn yields depend on the metallicity of the progenitor star or not. Aims. By using a well studied and well defined sample of 95 dwarf stars we aim at further constraining the formation site(s) of Mn. Methods. We derive Mn abundances through spectral synthesis of four Mn I lines at 539.4, 549.2, 601.3, and 601.6 nm. Stellar parameters and data for oxygen are taken from Bensby et al. (2003, 2004, 2005). Results. When comparing our Mn... (More)
Context. Manganese is an iron-peak element and although the nucleosynthesis path that leads to its formation is fairly well understood, it remains unclear which objects, SN II and/or SN Ia, that contribute the majority of Mn to the interstellar medium. It also remains unclear to which extent the supernovae Mn yields depend on the metallicity of the progenitor star or not. Aims. By using a well studied and well defined sample of 95 dwarf stars we aim at further constraining the formation site(s) of Mn. Methods. We derive Mn abundances through spectral synthesis of four Mn I lines at 539.4, 549.2, 601.3, and 601.6 nm. Stellar parameters and data for oxygen are taken from Bensby et al. (2003, 2004, 2005). Results. When comparing our Mn abundances with O abundances for the same stars we find that the abundance trends in the stars with kinematics typical of the thick disk can be explained by metallicity dependent yields from SN II. We go on and combine our data for dwarf stars in the disks with data for dwarf and giant stars in the metal-poor thick disk and halo from the literature. We find that dwarf and giant stars show the same trends, which indicates that neither non-LTE nor evolutionary effects are a major concern for Mn. Furthermore, the [Mn/O] vs. [O/H] trend in the halo is flat. Conclusions. We conclude that the simplest interpretation of our data is that Mn is most likely produced in SN II and that the Mn yields for such SNae must be metallicity dependent. Contribution from SN Ia in the metal-rich thin disk can not, however, be excluded. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stars : late-type, stars : abundances, Galaxy : abundances
in
Astronomy & Astrophysics
volume
467
issue
2
pages
665 - 677
publisher
EDP Sciences
external identifiers
  • wos:000246424900030
  • scopus:34249326233
ISSN
0004-6361
DOI
10.1051/0004-6361:20065797
language
English
LU publication?
yes
id
a49feb72-a757-4af8-84c1-0be6401964eb (old id 665124)
date added to LUP
2007-12-10 12:01:11
date last changed
2017-05-14 04:12:49
@article{a49feb72-a757-4af8-84c1-0be6401964eb,
  abstract     = {Context. Manganese is an iron-peak element and although the nucleosynthesis path that leads to its formation is fairly well understood, it remains unclear which objects, SN II and/or SN Ia, that contribute the majority of Mn to the interstellar medium. It also remains unclear to which extent the supernovae Mn yields depend on the metallicity of the progenitor star or not. Aims. By using a well studied and well defined sample of 95 dwarf stars we aim at further constraining the formation site(s) of Mn. Methods. We derive Mn abundances through spectral synthesis of four Mn I lines at 539.4, 549.2, 601.3, and 601.6 nm. Stellar parameters and data for oxygen are taken from Bensby et al. (2003, 2004, 2005). Results. When comparing our Mn abundances with O abundances for the same stars we find that the abundance trends in the stars with kinematics typical of the thick disk can be explained by metallicity dependent yields from SN II. We go on and combine our data for dwarf stars in the disks with data for dwarf and giant stars in the metal-poor thick disk and halo from the literature. We find that dwarf and giant stars show the same trends, which indicates that neither non-LTE nor evolutionary effects are a major concern for Mn. Furthermore, the [Mn/O] vs. [O/H] trend in the halo is flat. Conclusions. We conclude that the simplest interpretation of our data is that Mn is most likely produced in SN II and that the Mn yields for such SNae must be metallicity dependent. Contribution from SN Ia in the metal-rich thin disk can not, however, be excluded.},
  author       = {Feltzing, Sofia and Fohlman, M. and Bensby, Thomas},
  issn         = {0004-6361},
  keyword      = {stars : late-type,stars : abundances,Galaxy : abundances},
  language     = {eng},
  number       = {2},
  pages        = {665--677},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {Manganese trends in a sample of thin and thick disk stars - The origin of Mn},
  url          = {http://dx.doi.org/10.1051/0004-6361:20065797},
  volume       = {467},
  year         = {2007},
}