The VLT-FLAMES survey of massive stars: Surface chemical compositions of B-type stars in the Magellanic Clouds

I. Hunter, P. L. Dufton, S. J. Smartt, R. S I Ryans, C. J. Evans, D. J. Lennon, C. Trundle, Ivan - Hubeny, T. Lanz

Research output: Contribution to journalArticle

135 Citations (Scopus)

Abstract

We present an analysis of high-resolution FLAMES spectra of approximately 50 early B-type stars in three young clusters at different metallicities, NGC6611 in the Galaxy, N 11 in the Large Magellanic Cloud (LMC) and NGC 346 in the Small Magellanic Cloud (SMC). Using the TLUSTY non-LTE model atmospheres code, atmospheric parameters and photospheric abundances (C, N, O, Mg and Si) of each star have been determined. These results represent a significant improvement on the number of Magellanic Cloud B-type stars with detailed and homogeneous estimates of their atmospheric parameters and chemical compositions. The relationships between effective temperature and spectral type are discussed for all three metallicity regimes, with the effective temperature for a given spectral type increasing as one moves to a lower metallicity regime. Additionally the difficulties in estimating the microturbulent velocity and the anomalous values obtained, particularly in the lowest metallicity regime, are discussed. Our chemical composition estimates are compared with previous studies, both stellar and interstellar with, in general, encouraging agreement being found. Abundances in the Magellanic Clouds relative to the Galaxy are discussed and we also present our best estimates of the base-line chemical composition of the LMC and SMC as derived from B-type stars. Additionally we discuss the use of nitrogen as a probe of the evolutionary history of stars, investigating the roles of rotational mixing, mass-loss, blue loops and binarity on the observed nitrogen abundances and making comparisons with stellar evolutionary models where possible.

Original languageEnglish (US)
Pages (from-to)277-300
Number of pages24
JournalAstronomy and Astrophysics
Volume466
Issue number1
DOIs
StatePublished - Apr 2007

Fingerprint

Magellanic clouds
massive stars
chemical composition
stars
metallicity
nitrogen
estimates
temperature
probe
galaxies
stellar models
atmosphere
history
estimating
histories
atmospheres
parameter
probes
high resolution

Keywords

  • Galaxies: abundances
  • Magellanic clouds
  • Stars: abundances
  • Stars: atmospheres
  • Stars: early-type

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Hunter, I., Dufton, P. L., Smartt, S. J., Ryans, R. S. I., Evans, C. J., Lennon, D. J., ... Lanz, T. (2007). The VLT-FLAMES survey of massive stars: Surface chemical compositions of B-type stars in the Magellanic Clouds. Astronomy and Astrophysics, 466(1), 277-300. https://doi.org/10.1051/0004-6361:20066148

The VLT-FLAMES survey of massive stars : Surface chemical compositions of B-type stars in the Magellanic Clouds. / Hunter, I.; Dufton, P. L.; Smartt, S. J.; Ryans, R. S I; Evans, C. J.; Lennon, D. J.; Trundle, C.; Hubeny, Ivan -; Lanz, T.

In: Astronomy and Astrophysics, Vol. 466, No. 1, 04.2007, p. 277-300.

Research output: Contribution to journalArticle

Hunter, I, Dufton, PL, Smartt, SJ, Ryans, RSI, Evans, CJ, Lennon, DJ, Trundle, C, Hubeny, I & Lanz, T 2007, 'The VLT-FLAMES survey of massive stars: Surface chemical compositions of B-type stars in the Magellanic Clouds', Astronomy and Astrophysics, vol. 466, no. 1, pp. 277-300. https://doi.org/10.1051/0004-6361:20066148
Hunter, I. ; Dufton, P. L. ; Smartt, S. J. ; Ryans, R. S I ; Evans, C. J. ; Lennon, D. J. ; Trundle, C. ; Hubeny, Ivan - ; Lanz, T. / The VLT-FLAMES survey of massive stars : Surface chemical compositions of B-type stars in the Magellanic Clouds. In: Astronomy and Astrophysics. 2007 ; Vol. 466, No. 1. pp. 277-300.
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N2 - We present an analysis of high-resolution FLAMES spectra of approximately 50 early B-type stars in three young clusters at different metallicities, NGC6611 in the Galaxy, N 11 in the Large Magellanic Cloud (LMC) and NGC 346 in the Small Magellanic Cloud (SMC). Using the TLUSTY non-LTE model atmospheres code, atmospheric parameters and photospheric abundances (C, N, O, Mg and Si) of each star have been determined. These results represent a significant improvement on the number of Magellanic Cloud B-type stars with detailed and homogeneous estimates of their atmospheric parameters and chemical compositions. The relationships between effective temperature and spectral type are discussed for all three metallicity regimes, with the effective temperature for a given spectral type increasing as one moves to a lower metallicity regime. Additionally the difficulties in estimating the microturbulent velocity and the anomalous values obtained, particularly in the lowest metallicity regime, are discussed. Our chemical composition estimates are compared with previous studies, both stellar and interstellar with, in general, encouraging agreement being found. Abundances in the Magellanic Clouds relative to the Galaxy are discussed and we also present our best estimates of the base-line chemical composition of the LMC and SMC as derived from B-type stars. Additionally we discuss the use of nitrogen as a probe of the evolutionary history of stars, investigating the roles of rotational mixing, mass-loss, blue loops and binarity on the observed nitrogen abundances and making comparisons with stellar evolutionary models where possible.

AB - We present an analysis of high-resolution FLAMES spectra of approximately 50 early B-type stars in three young clusters at different metallicities, NGC6611 in the Galaxy, N 11 in the Large Magellanic Cloud (LMC) and NGC 346 in the Small Magellanic Cloud (SMC). Using the TLUSTY non-LTE model atmospheres code, atmospheric parameters and photospheric abundances (C, N, O, Mg and Si) of each star have been determined. These results represent a significant improvement on the number of Magellanic Cloud B-type stars with detailed and homogeneous estimates of their atmospheric parameters and chemical compositions. The relationships between effective temperature and spectral type are discussed for all three metallicity regimes, with the effective temperature for a given spectral type increasing as one moves to a lower metallicity regime. Additionally the difficulties in estimating the microturbulent velocity and the anomalous values obtained, particularly in the lowest metallicity regime, are discussed. Our chemical composition estimates are compared with previous studies, both stellar and interstellar with, in general, encouraging agreement being found. Abundances in the Magellanic Clouds relative to the Galaxy are discussed and we also present our best estimates of the base-line chemical composition of the LMC and SMC as derived from B-type stars. Additionally we discuss the use of nitrogen as a probe of the evolutionary history of stars, investigating the roles of rotational mixing, mass-loss, blue loops and binarity on the observed nitrogen abundances and making comparisons with stellar evolutionary models where possible.

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