2010A&A...515A..10D


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET01:38:17

2010A&A...515A..10D - Astronomy and Astrophysics, volume 515, A10-10 (2010/6-1)

Is there a highly magnetized neutron star in GX 301-2?

DOROSHENKO V., SANTANGELO A., SULEIMANOV V., KREYKENBOHM I., STAUBERT R., FERRIGNO C. and KLOCHKOV D.

Abstract (from CDS):

We present the results of an in-depth study of the long-period X-ray pulsar GX 301-2. Using archival data of INTEGRAL, RXTE ASM, and CGRO BATSE, we study the spectral and timing properties of the source. Comparison of our timing results with previously published work reveals a secular decay of the orbital period at a rate of ≃-3.25x10–5d/yr, which is an order of magnitude faster than for other known systems. We argue that this is probably result either of the apsidal motion or of gravitational coupling of the matter lost by the optical companion with the neutron star, although current observations do not allow us to distinguish between those possibilities. We also propose a model to explain the observed long pulse period. We find that a very strong magnetic field B ∼1014G can explain the observed pulse period in the framework of existing models for torques affecting the neutron star. We show that the apparent contradiction with the magnetic field strength BCRSF∼4x1012 G derived from the observed cyclotron line position may be resolved if the line formation region resides in a tall accretion column of height ∼2.5-3RNS. The color temperature measured from the spectrum suggests that such a column may indeed be present, and our estimates show that its height is sufficient to explain the observed cyclotron line position.

Abstract Copyright:

Journal keyword(s): pulsars: individual: GX 301-2 - stars: neutron - binaries: general

Simbad objects: 7

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Number of rows : 7

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 SK 160 HXB 01 17 05.1447530244 -73 26 36.015353425 12.23 13.00 13.15   13.17 O9.7Ia+ 809 0
2 V* V662 Cas HXB 01 18 02.6973905772 +65 17 29.829417242 12.27 11.99 11.14 10.33 9.58 B1Iae 236 0
3 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
4 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4 12.27     O9III/Veq 1004 0
5 V* BP Cru HXB 12 26 37.5607088371 -62 46 13.259605389   12.70 10.66     B1.5Iaeq 614 0
6 V* QV Nor HXB 15 42 23.3633078550 -52 23 09.576918639   16.3 14.5     B0.2Ia:e 379 1
7 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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2021.03.03-01:38:17

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