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Iron depletion in the hot bubbles in planetary nebulae
Leonid N. Georgiev, Michael G. Richer, Anabel Arrieta +1
We have searched for the emission from \fex and \fexiv that is expected from the gas emitting in diffuse X-rays in \bd, NGC 6543, NGC 7009, and NGC 7027. Neither line was detected…
Supernova Remnant 1987A: High Resolution Images and Spectrum from Chandra Observations
Sangwook Park, Svetozar A. Zhekov, David N. Burrows +3
We report on the morphological and spectral evolution of SNR 1987A from the monitoring observations with the Chandra/ACIS. As of 2005, the X-ray-bright lobes are continuously brigh…
Observations of Binary and Single Wolf-Rayet Stars with XMM-Newton and Chandra
S. Skinner, M. Guedel, W. Schmutz +1
We present an overview of recent X-ray observations of Wolf-Rayet (WR) stars with XMM-Newton and Chandra. A new XMM spectrum of the nearby WN8 + OB binary WR 147 shows hard absorbe…
The reverse shock of SNR1987A at 18 years after outburst
Nathan Smith, Svetozar A. Zhekov, Kevin Heng +3
We use low-dispersion spectra obtained at the Magellan Observatory to study the broad H-alpha emission from the reverse shock of the infant supernova remnant SNR1987A. These spectr…
Supernova Remnant 1987A: Opening the Future by Reaching the Past
Sangwook Park, Svetozar A. Zhekov, David N. Burrows +1
We report an up-turn in the soft X-ray light curve of supernova remnant (SNR) 1987A in late 2003 (~6200 days after the explosion), as observed with the Chandra X-ray Observatory. S…
Chandra Observations of Shock Kinematics in Supernova Remnant 1987A
S. A. Zhekov, R. McCray, K. J. Borkowski +2
We report the first results from deep X-ray observations of the SNR 1987A with the Chandra LETG. Temperatures inferred from line ratios range from 0.1 - 2 keV and increase with ion…