209 citations
- Bulgarian Academy of SciencesBG36 papers
- University of Colorado BoulderUS19 papers
- Joint Institute for Laboratory AstrophysicsUS18 papers
- Pennsylvania State UniversityUS9 papers
- Institute of Astronomy and National Astronomical ObservatoryBG8 papers
- Max Planck Institute for Solar System ResearchDE6 papers
- Goddard Space Flight CenterUS5 papers
- Physikalisch-Meteorologisches Observatorium DavosCH5 papers
- Paul Scherrer InstituteCH4 papers
- Sofia University "St. Kliment Ohridski"BG4 papers
- Universidade de São PauloBR4 papers
- Center for Astrophysics Harvard & SmithsonianUS3 papers
24 papers · 1 filter
Chandra HETG Spectra of SN 1987A at 20 years
D. Dewey, S. A. Zhekov, R. McCray +1
We have undertaken deep, high-resolution observations of SN 1987A at ~20 years after its explosion with the Chandra HETG and LETG spectrometers. Here we present the HETG X-ray spec…
Colliding Stellar Wind Models with Nonequilibrium Ionization: X-rays from WR 147
Svetozar A. Zhekov
The effects of nonequilibrium ionization are explicitly taken into account in a numerical model which describes colliding stellar winds (CSW) in massive binary sytems. This new mod…
X-Rays From Massive OB Stars: Thermal Emission From Radiative Shocks
Svetozar A. Zhekov, Francesco Palla
Chandra gratings spectra of a sample of 15 massive OB stars were analyzed under the basic assumption that the X-ray emission is produced in an ensemble of shocks formed in the wind…
XMM-Newton X-ray Observations of the Wolf-Rayet Binary System WR 147
S. L. Skinner, S. A. Zhekov, M. Guedel +1
We present results of a 20 ksec X-ray observation of the Wolf-Rayet (WR) binary system WR 147 obtained with XMM-Newton. Previous studies have shown that this system consists of a n…
The Chandra X-ray Spectrum of the 10.6 s Pulsar in Westerlund 1: Testing the Magnetar Hypothesis
S. L. Skinner, R. Perna, S. A. Zhekov
Two sensitive Chandra X-ray observations of the heavily-reddened galactic starburst cluster Westerlund 1 in May and June 2005 detected a previously unknown X-ray pulsar (CXO J16471…
Evolutionary Status of SNR 1987A at the Age of Eighteen
Sangwook Park, Svetozar A. Zhekov, David N. Burrows +3
18 yr after the supernova explosion, the blast wave of SNR 1987A is entering the main body of the equatorial circumstellar material, which is causing a dramatic brightening o…