We present Chandra HETGS spectroscopy of the Be/X-ray binary 1A 0535+262 obtained during the 2009/2010 giant outburst. These are the first CCD grating spectra of this type of system during a giant outburst. Our spectra reveal a number of lines including a narrow Fe K_alpha emission line with a FWHM of ~ 5000 km s^-1. For the first time, we detect the presence of a highly ionized outflow in a Be/X-ray binary. Assuming that the line is He-like Fe XXV, fits with a simple Gaussian imply an outflow velocity of ~ 1500 km s^-1. However, self-consistent photoionization modeling with XSTAR suggests that Fe XXIII-XXIV must also contribute. In this case, an outflow velocity of ~ 3000 km s^-1 is implied. These results are discussed in the context of the accretion flow in Be-star, neutron star, and black hole X-ray binaries.
@article{arxiv.1009.2240,
title = {Chandra grating spectroscopy of the Be/X-ray binary 1A 0535+262},
author = {Mark T. Reynolds and Jon M. Miller},
journal= {arXiv preprint arXiv:1009.2240},
year = {2015}
}
Comments
7 pages, 4 figures, formatted using emulateapj.cls. Accepted for publication in ApJ