Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Zhekov, S. A."'
Autor:
Zhekov, S. A., Skinner, S. L.
We present an analysis of XMM-Newton X-ray data of WR30a (WO+O), a close massive binary that harbours an oxygen-rich Wolf-Rayet star. Its spectrum is characterized by the presence of two well-separated broad peaks, or `bumps', one peaking at energies
Externí odkaz:
http://arxiv.org/abs/1506.04634
The short-period (1.64 d) near-contact eclipsing WN6+O9 binary system CQ Cep provides an ideal laboratory for testing the predictions of X-ray colliding wind shock theory at close separation where the winds may not have reached terminal speeds before
Externí odkaz:
http://arxiv.org/abs/1411.4075
Autor:
Helder, E. A., Broos, P. S., Dewey, D., Dwek, E., McCray, R., Park, S., Racusin, J. L., Zhekov, S. A., Burrows, D. N.
We report on the present stage of SN 1987A as observed by the Chandra X-ray Observatory. We reanalyze published Chandra observations and add three more epochs of Chandra data to get a consistent picture of the evolution of the X-ray fluxes in several
Externí odkaz:
http://arxiv.org/abs/1212.2664
Publikováno v:
ApJ, 746, 142 (2012)
High-resolution data of the peculiar magnetic massive star HD148937 were obtained with Chandra-HETGS, and are presented here in combination with a re-analysis of the older XMM-RGS data. The lines of the high-Z elements (Mg, Si, S) were found to be un
Externí odkaz:
http://arxiv.org/abs/1111.7186
We summarize new X-ray detections of four nitrogen-type Wolf-Rayet (WR) stars obtained in a limited survey aimed at establishing the X-ray properties of WN stars across their full range of spectral subtypes. None of the detected stars is so far known
Externí odkaz:
http://arxiv.org/abs/0912.1326
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 spectra of SN 1987A having unprecedented spectral resolution and signal-to
Externí odkaz:
http://arxiv.org/abs/0802.2340
Publikováno v:
Mon.Not.Roy.Astron.Soc.378:1491-1498,2007
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 nitrogen-type WN8 star plus an OB companion whose winds are interacting
Externí odkaz:
http://arxiv.org/abs/0704.3235
Publikováno v:
Astrophys.J.653:587-592,2006
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 J164710.20-455217). Its slow 10.6 s pulsations, moderate X-ray temperature k
Externí odkaz:
http://arxiv.org/abs/astro-ph/0607528
Publikováno v:
Astrophys.J. 639 (2006) L35-L38
Recent optical and IR studies have revealed that the heavily-reddened starburst cluster Westerlund 1 (Wd 1) contains at least 22 Wolf-Rayet (WR) stars, comprising the richest WR population of any galactic cluster. We present results of a senstive Cha
Externí odkaz:
http://arxiv.org/abs/astro-ph/0601550
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 absorbed X-ray emission, including the Fe K-alpha line complex, characteristi
Externí odkaz:
http://arxiv.org/abs/astro-ph/0511137