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Fluorine in the Solar Neighborhood: Is It All Produced in Asymptotic Giant Branch Stars?

Jönsson, Henrik LU ; Ryde, Nils LU ; Harper, G. M.; Richter, M. J. and Hinkle, K. H. (2014) In Astrophysical Journal Letters 789(2).
Abstract
The origin of "cosmic" fluorine is uncertain, but there are three proposed production sites/mechanisms for the origin: asymptotic giant branch (AGB) stars, nu nucleosynthesis in Type II supernovae, and/or the winds of Wolf-Rayet stars. The relative importance of these production sites has not been established even for the solar neighborhood, leading to uncertainties in stellar evolution models of these stars as well as uncertainties in the chemical evolution models of stellar populations. We determine the fluorine and oxygen abundances in seven bright, nearby giants with well determined stellar parameters. We use the 2.3 mu m vibrational-rotational HF line and explore a pure rotational HF line at 12.2 mu m. The latter has never been used... (More)
The origin of "cosmic" fluorine is uncertain, but there are three proposed production sites/mechanisms for the origin: asymptotic giant branch (AGB) stars, nu nucleosynthesis in Type II supernovae, and/or the winds of Wolf-Rayet stars. The relative importance of these production sites has not been established even for the solar neighborhood, leading to uncertainties in stellar evolution models of these stars as well as uncertainties in the chemical evolution models of stellar populations. We determine the fluorine and oxygen abundances in seven bright, nearby giants with well determined stellar parameters. We use the 2.3 mu m vibrational-rotational HF line and explore a pure rotational HF line at 12.2 mu m. The latter has never been used before for an abundance analysis. To be able to do this, we have calculated a line list for pure rotational HF lines. We find that the abundances derived from the two diagnostics agree. Our derived abundances are well reproduced by chemical evolution models including only fluorine production in AGB stars and, therefore, we draw the conclusion that this might be the main production site of fluorine in the solar neighborhood. Furthermore, we highlight the advantages of using the 12 mu m HF lines to determine the possible contribution of the. process to the fluorine budget at low metallicities where the difference between models including and excluding this process is dramatic. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
molecular data, solar neighborhood, stars: abundances
in
Astrophysical Journal Letters
volume
789
issue
2
publisher
University of Chicago Press
external identifiers
  • wos:000339876800016
  • scopus:84903987038
ISSN
2041-8213
DOI
10.1088/2041-8205/789/2/L41
language
English
LU publication?
yes
id
e32e7972-86c5-49de-b23d-6106e1a20116 (old id 4662547)
date added to LUP
2014-09-25 13:32:48
date last changed
2017-10-01 03:32:40
@article{e32e7972-86c5-49de-b23d-6106e1a20116,
  abstract     = {The origin of "cosmic" fluorine is uncertain, but there are three proposed production sites/mechanisms for the origin: asymptotic giant branch (AGB) stars, nu nucleosynthesis in Type II supernovae, and/or the winds of Wolf-Rayet stars. The relative importance of these production sites has not been established even for the solar neighborhood, leading to uncertainties in stellar evolution models of these stars as well as uncertainties in the chemical evolution models of stellar populations. We determine the fluorine and oxygen abundances in seven bright, nearby giants with well determined stellar parameters. We use the 2.3 mu m vibrational-rotational HF line and explore a pure rotational HF line at 12.2 mu m. The latter has never been used before for an abundance analysis. To be able to do this, we have calculated a line list for pure rotational HF lines. We find that the abundances derived from the two diagnostics agree. Our derived abundances are well reproduced by chemical evolution models including only fluorine production in AGB stars and, therefore, we draw the conclusion that this might be the main production site of fluorine in the solar neighborhood. Furthermore, we highlight the advantages of using the 12 mu m HF lines to determine the possible contribution of the. process to the fluorine budget at low metallicities where the difference between models including and excluding this process is dramatic.},
  articleno    = {L41},
  author       = {Jönsson, Henrik and Ryde, Nils and Harper, G. M. and Richter, M. J. and Hinkle, K. H.},
  issn         = {2041-8213},
  keyword      = {molecular data,solar neighborhood,stars: abundances},
  language     = {eng},
  number       = {2},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal Letters},
  title        = {Fluorine in the Solar Neighborhood: Is It All Produced in Asymptotic Giant Branch Stars?},
  url          = {http://dx.doi.org/10.1088/2041-8205/789/2/L41},
  volume       = {789},
  year         = {2014},
}