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Physical Properties of Wolf-Rayet Stars
Paul A Crowther
The striking broad emission line spectroscopic appearance of Wolf-Rayet (WR) stars has long defied analysis, due to the extreme physical conditions within their line and continuum…
A census of the Wolf-Rayet content in Westerlund 1 from near-infrared imaging and spectroscopy
Paul A. Crowther, L. J. Hadfield, J. S. Clark +2
New NTT/SOFI imaging and spectroscopy of the Wolf-Rayet population in Westerlund 1 are presented. Narrow-band near-IR imaging together with follow up spectroscopy reveals four new…
Properties of Galactic B supergiants
P. A. Crowther, D. J. Lennon, N. R. Walborn +1
Physical and wind properties of Galactic B supergiants are presented based upon non-LTE line blanketed model atmospheres, including Sher 25 toward the NGC 3603 cluster. We compare…
Metallicity Dependent Wolf-Rayet Winds
Paul A. Crowther
Observational and theoretical evidence in support of metallicity dependent winds for Wolf-Rayet stars is considered. Well known differences in Wolf-Rayet subtype distributions in t…
The VLT-FLAMES survey of massive stars: Mass loss and rotation of early-type stars in the SMC
M. R. Mokiem, A. de Koter, C. J. Evans +9
We have studied the optical spectra of a sample of 31 O- and early B-type stars in the Small Magellanic Cloud, 21 of which are associated with the young massive cluster NGC 346. St…
V605 Aql: The Older Twin of Sakurai's Object
Geoffrey C. Clayton, F. Kerber, N. Pirzkal +3
New optical spectra have been obtained with VLT/FORS2 of the final helium shell flash (FF) star, V605 Aql, which peaked in brightness in 1919. New models suggest that this star is…