Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-02-16
Astronomy and Astrophysics
Astrophysics
11 pages, 3 figures; Accepted for publication in ApJ Letters
Scientific paper
10.1086/312608
We present a preliminary analysis of the 1--10 keV spectrum of the massive X-ray binary Cyg 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 a ~ 800 km/s large scale velocity field, as well as a ~1500 km/s FWHM Doppler broadening in the source. We briefly touch on the implications of these findings for the structure of the Wolf-Rayet wind.
Brinkman Albert C.
Cottam Jean
Kaastra Jelle S.
Liedahl Duane Allen
Paerels Frits
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