Chandra High-Resolution Spectroscopy of the Absorption-Line Features in the Low-Mass X-Ray Binary GX 13+1

Details Chandra High-Resolution Spectroscopy of the Absorption-Line Features in the Low-Mass X-Ray Binary GX 13+1 Chandra High-Resolution Spectroscopy of the Absorption-Line Features in the Low-Mass X-Ray Binary GX 13+1

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...609..325u&link_type=abstract

The Astrophysical Journal, Volume 609, Issue 1, pp. 325-334.

Astronomy and Astrophysics

Astronomy

35

Stars: Individual: Alphanumeric: Gx 13+1, X-Rays: Binaries, X-Rays: Stars

Scientific paper

We present the results of high-resolution spectroscopy of absorption-line features of highly ionized ions in the X-ray spectra of GX 13+1 with the Chandra HETGS. We have resolved Kα absorption lines of hydrogen-like Fe, Mn, Cr, Ca, Ar, S, Si, and Mg ions and helium-like Fe ions. Applying the Voigt profile to these spectral features, we find that the plasma responsible for the absorption lines has a significant blueshift of 460+/-70 km s-1, indicating an outflow velocity of ~400 km s-1 corrected for the proper motion, with a line-of-sight velocity dispersion of 490+110-140 km s-1. The plasma is photoionized with an ionization parameter of logξ~=4.1-4.7. The inferred mass outflow rate is 0.7×1018 g s-1 or higher, comparable to the mass accretion rate (1018 g s-1) estimated from the continuum spectrum. This indicates that the mass outflow plays a significant role to determine the whole dynamics of the accretion disk. We consider a simplified radiation-driven disk wind model for the origin of the outflow. Our observations are explained by the wind originating from radii of ~1010-1011 cm with a density >~1013 cm-3.

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