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Carbon stars in local group dwarf galaxies: C and O abundances

Wahlin, R.; Eriksson, K.; Gustafsson, B.; Hinkle, K.H.; Ryde, Nils LU and Westerlund, B. (2006) In Memorie della Societa Astronomica Italiana 77. p.955-960
Abstract
We present abundances of carbon and oxygen as well as abundance ratios 12C/13C for a sample of carbon stars in the LMC, SMC, Carina, Sculptor and Fornax dwarf galaxies. The overall metallicities in these dwarf galaxies are lower than in the galactic disc. The observations cover most of the AGB and we discuss the abundance patterns in different regions along the AGB. The abundances are determined from infrared spectra obtained with the ISAAC spectrometer on VLT (R=1500) and the Phoenix Spectrometer on Gemini South (R=50000). The synthetic spectra used in the analysis were computed with MARCS model atmospheres. We find that the oxygen abundance is decreasing with decreasing overall metallicity of the system while the C/O ratio at a given... (More)
We present abundances of carbon and oxygen as well as abundance ratios 12C/13C for a sample of carbon stars in the LMC, SMC, Carina, Sculptor and Fornax dwarf galaxies. The overall metallicities in these dwarf galaxies are lower than in the galactic disc. The observations cover most of the AGB and we discuss the abundance patterns in different regions along the AGB. The abundances are determined from infrared spectra obtained with the ISAAC spectrometer on VLT (R=1500) and the Phoenix Spectrometer on Gemini South (R=50000). The synthetic spectra used in the analysis were computed with MARCS model atmospheres. We find that the oxygen abundance is decreasing with decreasing overall metallicity of the system while the C/O ratio at a given evolutionary phase is increasing with decreasing oxygen abundance.

Based on observations collected at the European Southern Observatory, Paranal, Chile (ESO Programme 70.D-0414 & 072.D-0501) (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Stars: carbon, Stars: abundances, Galaxies: dwarf, Stars: AGB and post-AGB, Local Group, Infrared: stars
in
Memorie della Societa Astronomica Italiana
volume
77
pages
955 - 960
language
English
LU publication?
no
id
be413a04-50a8-4f31-8071-421ac4d9f77b (old id 942638)
date added to LUP
2008-01-22 12:26:21
date last changed
2016-06-29 08:56:55
@misc{be413a04-50a8-4f31-8071-421ac4d9f77b,
  abstract     = {We present abundances of carbon and oxygen as well as abundance ratios 12C/13C for a sample of carbon stars in the LMC, SMC, Carina, Sculptor and Fornax dwarf galaxies. The overall metallicities in these dwarf galaxies are lower than in the galactic disc. The observations cover most of the AGB and we discuss the abundance patterns in different regions along the AGB. The abundances are determined from infrared spectra obtained with the ISAAC spectrometer on VLT (R=1500) and the Phoenix Spectrometer on Gemini South (R=50000). The synthetic spectra used in the analysis were computed with MARCS model atmospheres. We find that the oxygen abundance is decreasing with decreasing overall metallicity of the system while the C/O ratio at a given evolutionary phase is increasing with decreasing oxygen abundance.<br/><br>
Based on observations collected at the European Southern Observatory, Paranal, Chile (ESO Programme 70.D-0414 &amp; 072.D-0501)},
  author       = {Wahlin, R. and Eriksson, K. and Gustafsson, B. and Hinkle, K.H. and Ryde, Nils and Westerlund, B.},
  keyword      = {Stars: carbon,Stars: abundances,Galaxies: dwarf,Stars: AGB and post-AGB,Local Group,Infrared: stars},
  language     = {eng},
  pages        = {955--960},
  series       = {Memorie della Societa Astronomica Italiana},
  title        = {Carbon stars in local group dwarf galaxies: C and O abundances},
  volume       = {77},
  year         = {2006},
}