UNSPECIFIED. (2004) The variable cyclotron line in GX 301-2. ASTRONOMY & ASTROPHYSICS, 427 (3). pp. 975-986. ISSN 0004-6361

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Abstract

We present pulse phase resolved spectra of the hypergiant high mass X-ray binary GX301-2. We observed the source in 2001 October with RXTE continuously for a total on-source time of almost 200 ks. We model the continuum with both, a heavily absorbed partial covering model and a reflection model. In either case we find that the well known cyclotron resonant scattering feature (CRSF) at similar to 35 keV is - although present at all pulse phases - strongly variable over the pulse: the line position varies by 25% from 30 keV in the fall of the secondary pulse to 38 keV in the fall of the main pulse where it is deepest. The line variability implies that we are seeing regions of magnetic field strength varying between 3.4 x 10(12) G and 4.2 x 10(12) G.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Journal or Publication Title:	ASTRONOMY & ASTROPHYSICS
Publisher:	E D P SCIENCES
ISSN:	0004-6361
Date:	December 2004
Volume:	427
Number:	3
Number of Pages:	12
Page Range:	pp. 975-986
Identification Number:	10.1051/0004-6361:20035836
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/7790

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