The Galactic WC stars Stellar parameters from spectral analyses indicate a new evolutionary sequence
[Abridged] [...] AIMS: We aim to establish the stellar parameters and mass-loss rates of the Galactic WC stars. These data provide the empirical basis of studies of (i) the role of WC stars in the…
The Wolf-Rayet stars in the Large Magellanic Cloud - A comprehensive analysis of the WN class
- R. Hainich, U. Ruhling, W. Hamann
- Physics
- 21 January 2014
Context. Massive stars, although being important building blocks of galaxies, are still not fully understood. This especially holds true for Wolf-Rayet (WR) stars with their strong mass loss, whose…
Early Magnetic B-Type Stars: X-ray Emission and Wind Properties
- L. Oskinova, H. Todt, R.Ignace, J. Brown, J. Cassinelli, W. Hamann
- Physics
- 2 June 2011
We present a comprehensive study of X-ray emission and wind properties of massive magnetic early B-type stars. Dedicated XMM-Newtonobservations were obtained for three early type B-type stars, ξ 1…
The Galactic WN stars revisited
- W. Hamann, G. Grafener, L. Oskinova
- PhysicsAstronomy & Astrophysics
- 9 April 2019
Comprehensive spectral analyses of the Galactic Wolf-Rayet stars of the nitrogen sequence (i.e. the WN subclass) have been performed in a previous paper. However, the distances of these objects were…
The Galactic WC and WO stars
- A. Sander, W. Hamann, L. Oskinova
- PhysicsAstronomy & Astrophysics
- 11 July 2018
Wolf-Rayet stars of the carbon sequence (WC stars) are an important cornerstone in the late evolution of massive stars before their core collapse. As core-helium burning, hydrogen-free objects with…
The Quintuplet cluster - II. Analysis of the WN stars
- A. Liermann, W. Hamann, L. Oskinova, H. Todt, K. Butler
- Physics
- 26 November 2010
Based on K-band integral-field spectroscopy, we analyze four Wolf-Rayet stars of the nitrogen sequence (WN) found in the inner part of the Quintuplet cluster. All WN stars (WR 102d, WR 102i, WR…
The Wolf-Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud
- T. Shenar, D. Sablowski, W. Hamann
- PhysicsAstronomy & Astrophysics
- 22 May 2019
Context. Massive Wolf–Rayet (WR) stars dominate the radiative and mechanical energy budget of galaxies and probe a critical phase in the evolution of massive stars prior to core collapse. It is not…
Wolf-Rayet stars in the Small Magellanic Cloud: I. Analysis of the single WN stars
- R. Hainich, D. Pasemann, H. Todt, T. Shenar, A. Sander, W. Hamann
- Physics
- 14 July 2015
Wolf-Rayet (WR) stars have a severe impact on their environments owing to their strong ionizing radiation fields and powerful stellar winds. Since these winds are considered to be driven by radiation…
Wolf-Rayet stars in the Small Magellanic Cloud: II. Analysis of the binaries
- T. Shenar, R. Hainich, N. Richardson
- Physics
- 4 April 2016
Massive WR stars are evolved massive stars characterized by strong mass-loss. Hypothetically, they can form either as single stars or as mass donors in close binaries. About 40% of the known WR stars…
ON THE WEAK-WIND PROBLEM IN MASSIVE STARS: X-RAY SPECTRA REVEAL A MASSIVE HOT WIND IN μ COLUMBAE
- D. Huenemoerder, L. Oskinova, S. Kitamoto
- Physics
- 3 August 2012
μ Columbae is a prototypical weak-wind O star for which we have obtained a high-resolution X-ray spectrum with the Chandra LETG/ACIS instrument and a low-resolution spectrum with Suzaku. This allows…
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