Journal
ASTROPHYSICAL JOURNAL
Volume 533, Issue 2, Pages L135-L138Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/312608
Keywords
atomic processes; stars : individual (Cygnus X-3); techniques : spectroscopic; X-rays : stars
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We present a preliminary analysis of the 1-10 keV spectrum of the massive X-ray binary Cygnus X-3, obtained with the high-energy transmission grating spectrometer on the Chandra X-Ray Observatory. The source reveals a richly detailed discrete emission spectrum, with clear signatures of photoionization-driven excitation. Among the spectroscopic novelties in the data are the first astrophysical detections of a number of He like triplets (Si, S, Ar) with emission-line ratios characteristic of photoionization equilibrium, fully resolved narrow radiative recombination continua of Mg, Si, and S, the presence of the H-like Fe Balmer series, and a clear detection of an similar to 800 km s(-1) large-scale velocity field as well as an similar to 1500 km s(-1) FWHM Doppler broadening in the source. We briefly touch on the implications of these findings for the structure of the Wolf-Rayet wind.
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