The Wolf-Rayet stars in the Large Magellanic Cloud: A comprehensive analysis of the WN class

Abstract

Aims: Following our comprehensive studies of the WR stars in the Milky Way, we now present spectroscopic analyses of almost all known WN stars in the LMC. Methods: For the quantitative analysis of the wind-dominated emission-line spectra, we employ the Potsdam Wolf-Rayet (PoWR) model atmosphere code. By fitting synthetic spectra to the observed spectral energy distribution and the available spectra (ultraviolet and optical), we obtain the physical properties of 107 stars. Results: We present the fundamental stellar and wind parameters for an almost complete sample of WN stars in the LMC. Among those stars that are putatively single, two different groups can be clearly distinguished. While 12% of our sample are more luminous than 10^6 Lsun and contain a significant amount of hydrogen, 88% of the WN stars, with little or no hydrogen, populate the luminosity range between log (L/Lsun) = 5.3...5.8. Conclusions: While the few extremely luminous stars (log (L/Lsun) > 6), if indeed single stars, descended directly from the main sequence at very high initial masses, the bulk of WN stars have gone through the red-supergiant phase. According to their luminosities in the range of log (L/Lsun) = 5.3...5.8, these stars originate from initial masses between 20 and 40 Msun. This mass range is similar to the one found in the Galaxy, i.e. the expected metallicity dependence of the evolution is not seen. Current stellar evolution tracks, even when accounting for rotationally induced mixing, still partly fail to reproduce the observed ranges of luminosities and initial masses. Moreover, stellar radii are generally larger and effective temperatures correspondingly lower than predicted from stellar evolution models, probably due to subphotospheric inflation.

17+46 pages; 10+54 figures; v2: typos corrected, space-saving layout for appendix C, published in A&A

References in corpus (24)

• Binary interaction dominates the evolution of massive stars
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 Msun stellar mass limit
• The effect of massive binaries on stellar populations and supernova progenitors
• The Galactic WN stars: Spectral analyses with line-blanketed model atmospheres versus stellar evolution models with and without rotation
• Bright OB stars in the Galaxy - III. Constraints on the radial stratification of the clumping factor in hot star winds from a combined Halpha, IR and radio analysis
• Mass loss from late-type WN stars and its Z-dependence: very massive stars approaching the Eddington limit
• The VLT-FLAMES survey of massive stars: rotation and nitrogen enrichment as the key to understanding massive star evolution
• The most massive stars in the Arches cluster
• Spitzer SAGE Infrared Photometry of Massive Stars in the Large Magellanic Cloud
• The VLT-FLAMES survey of massive stars: Evolution of surface N abundances and effective temperature scales in the Galaxy and Magellanic Clouds
• The Galactic WC stars: Stellar parameters from spectral analyses indicate a new evolutionary sequence
• New Optical Reddening Maps of the Large and Small Magellanic Clouds
• Implications of the metallicity dependence of Wolf-Rayet winds
• A Spectroscopic Survey of WNL Stars in the LMC: General Properties and Binary Status
• The WR population predicted by massive single star and by massive binary evolution
• An X-ray Survey of Wolf-Rayet Stars in the Magellanic Clouds. I. The Chandra ACIS Dataset
• The impact of rotation on the line profiles of Wolf-Rayet stars
• A first orbital solution for the very massive 30 Dor main-sequence WN6h+O binary R145
• Two extremely luminous WN stars in the Galactic center with circumstellar emission from dust and gas
• The Quintuplet Cluster II. Analysis of the WN stars
• R144 revealed as a double-lined spectroscopic binary
• Constraining GRB progenitor models by probing Wolf-Rayet wind geometries in the Large Magellanic Cloud
• An X-ray Survey of Wolf-Rayet Stars in the Magellanic Clouds. II. The ROSAT PSPC and HRI Datasets

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