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4D Grid-fitting of UV-optical spectra of massive stars. I. Numerical technique and its associated uncertainties
Blagovest V. Petrov, Svetozar A. Zhekov
The best way to check the validity of our theories (models) is by direct comparison with the experiment (observations). In this study, we address the numerical inaccuracies intrins…
X-ray Observations of the Enigmatic Wolf-Rayet System Theta Mus: Two's Company But Three's a Crowd
Stephen L. Skinner, Svetozar A. Zhekov, Manuel Guedel +1
Theta Mus is a remarkable spectroscopic binary (SB) consisting of a carbon-type Wolf-Rayet star and OV companion (WC6+O6-7V) in a 19-day orbit. In addition an O-supergiant is visua…
A global view on the colliding-wind binary WR 147
Svetozar A. Zhekov, Blagovest V. Petrov, Toma V. Tomov +1
We present results from a global view on the colliding-wind binary WR 147. We analysed new optical spectra of WR 147 obtained with Gran Telescopio CANARIAS and archive spectra from…
High Energy Processes in Wolf-Rayet Stars
Stephen L. Skinner, Werner Schmutz, Manuel Guedel +1
Wolf-Rayet (WR) stars are massive (10 M) evolved stars undergoing advanced nuclear burning in their cores, rapidly approaching the end of their lives as supernovae.…
An XMM-Newton observation of the symbiotic star AG Peg: the X-ray emission after the end of its 2015 outburst
Svetozar A. Zhekov, Toma V. Tomov
We present an analysis of the XMM-Newton observation of the symbiotic star AG Peg, obtained after the end of its 2015 outburst. The X-ray emission of AG Peg is soft and of thermal…
X-rays from the colliding wind binary WR 146
Svetozar A. Zhekov
The X-ray emission from the massive binary WR 146R is analysed in the framework of the colliding stellar wind (CSW) picture. The theoretical CSW model spectra match well the shape…