Chandra Grating Spectroscopy of the Be/X-ray Binary 1A 0535+262
Abstract
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 Kα emission line with an 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 accretion flow in Be-star, neutron star, and black hole X-ray binaries.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2010
- DOI:
- 10.1088/0004-637X/723/2/1799
- arXiv:
- arXiv:1009.2240
- Bibcode:
- 2010ApJ...723.1799R
- Keywords:
-
- accretion;
- accretion disks;
- stars: neutron;
- techniques: spectroscopic;
- X-rays: binaries;
- X-rays: individual: 1A 0535+262;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 7 pages, 4 figures, formatted using emulateapj.cls. Accepted for publication in ApJ