2004A&A...427..975K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET05:00:59

2004A&A...427..975K - Astronomy and Astrophysics, volume 427, 975-986 (2004/12-1)

The variable cyclotron line in GX301-2.

KREYKENBOHM I., WILMS J., COBURN W., KUSTER M., ROTHSCHILD R.E., HEINDL W.A., KRETSCHMAR P. and STAUBERT R.

Abstract (from CDS):

We present pulse phase resolved spectra of the hypergiant high mass X-ray binary GX 301-2. We observed the source in 2001 October with RXTE continuously for a total on-source time of almost 200ks. 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 ∼35keV is - although present at all pulse phases - strongly variable over the pulse: the line position varies by 25% from 30keV in the fall of the secondary pulse to 38keV 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 3.4x1012G and 4.2x1012G.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: magnetic fields - stars: pulsars: individual: GX 301-2

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 673 0
2 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1385 0
3 V* BP Cru HXB 12 26 37.5607088371 -62 46 13.259605389   12.70 10.66     B1.5Iaeq 614 0
4 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 533 1
5 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1945 0

    Equat.    Gal    SGal    Ecl

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2021.03.07-05:00:59

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