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MCA1B - A dormant LBV in M33?

Published online by Cambridge University Press:  07 August 2017

Paul A. Crowther ,
Linda J. Smith  and
Allan J. Willis
Paul A. Crowther
Affiliation:
Department of Physics and Astronomy, University College London Gower Street, London WC1E 6BT, U.K.
Linda J. Smith
Affiliation:
Department of Physics and Astronomy, University College London Gower Street, London WC1E 6BT, U.K.
Allan J. Willis
Affiliation:
Department of Physics and Astronomy, University College London Gower Street, London WC1E 6BT, U.K.

Abstract

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A detailed study of the Ofpe/WN9 candidate MCA1b in M33 (Willis et al. 1992) is presented, based on new high-resolution observations. We re-classify MCA1b as WN9-10 and determine its physical parameters (T* = 29 kK, logL/L⊙ = 5.9, log· = −4.0, v∞ = 420 km s−1) and composition (H/He = 2.6, N/He = 0.003, C/N = 0.2) using the Wolf-Rayet standard model. Overall, MCA1b is very similar to the LMC stars R84 (WN9, Crowther et al. 1994) and R71 (LBV, Lennon et al. 1994) indicating a similar evolutionary status and metallicity.

Keywords

stars: atmospheresWolf-Rayetabundanceswindsmass-loss
Type
Session V - poster summaries
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 331 - 332
Copyright
Copyright © Kluwer 1995 

References

Allen, D.A., Hyland, A.R., Hillier, D.J. 1990, MNRAS 244, 706 Google Scholar
Bohannan, B., Walborn, N.R. 1989, PASP 101, 639 CrossRefGoogle Scholar
Crowther, P.A., Hillier, D.J., Smith, L.J. 1994, A&A in press (Paper I) Google Scholar
Hillier, D.J. 1990, A&A 231, 116 Google Scholar
Lennon, D.J., Wobig, D., Kudritzki, R.P., Stahl, O. 1994, Sp. Sci. Rev. 66, 207 CrossRefGoogle Scholar
Meynet, G., Maeder, A., Schaller, G., Schaerer, D., Charbonnel, C. 1994, A&A Suppl. 103, 97 Google Scholar
Walborn, N.R. 1982, ApJ 256, 452 CrossRefGoogle Scholar
Willis, A.J., Schild, H., Smith, L.J. 1992, A&A 261, 419 Google Scholar