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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

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