The Ionized Stellar Wind in Vela X-1 during Eclipse
Author(s)Schulz, Norbert S.; Canizares, Claude R.; Lee, Julia C.; Sako, Masao
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We present a first analysis of a high-resolution X-ray spectrum of the ionized stellar wind of Vela X-1 during eclipse. The data were obtained with the High-Energy Transmission Grating Spectrometer on board the Chandra X-Ray Observatory. The spectrum is resolved into emission lines with fluxes between 0.02 and 1.04 × 10[superscript -4] photons cm[superscript -2] s[superscript -1]. We identify lines from a variety of charge states, including fluorescent lines from cold material and a warm photoionized wind. We can exclude signatures from collisionally ionized plasmas. For the first time, we identify fluorescent lines from L-shell ions from lower Z elements. We also detect radiative recombination continua from a kT = 10 eV (1.2 × 10[superscript 5] K) photoionized optically thin gas. The fluorescent line fluxes imly the existence of optically thick and clumped matter within or outside the warm photoionized plasma.
Departmentdelete; Kavli Institute for Astrophysics and Space Research
Astrophysical Journal. Letters
Schulz, Norbert S. et al. “The Ionized Stellar Wind in Vela X-1 During Eclipse.” The Astrophysical Journal 564.1 (2002): L21–L25.
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