2017A&A...608A..17T


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET12:07:24

2017A&A...608A..17T - Astronomy and Astrophysics, volume 608A, 17-17 (2017/12-1)

Stable accretion from a cold disc in highly magnetized neutron stars.

TSYGANKOV S.S., MUSHTUKOV A.A., SULEIMANOV V.F., DOROSHENKO V., ABOLMASOV P.K., LUTOVINOV A.A. and POUTANEN J.

Abstract (from CDS):

Aims. The aim of this paper is to investigate the transition of a strongly magnetized neutron star into the accretion regime with very low accretion rate.
Methods. For this purpose, we monitored the Be-transient X-ray pulsar GRO J1008-57 throughout a full orbital cycle. The current observational campaign was performed with the Swift/XRT telescope in the soft X-ray band (0.5-10keV) between two subsequent Type I outbursts in January and September 2016.
Results. The expected transition to the propeller regime was not observed. However, transitions between different regimes of accretion were detected. In particular, after an outburst, the source entered a stable accretion state characterised by an accretion rate of ∼1014-1015g/s. We associate this state with accretion from a cold (low-ionised) disc of temperature below ∼6500K. We argue that a transition to this accretion regime should be observed in all X-ray pulsars that have a certain combination of the rotation frequency and magnetic field strength. The proposed model of accretion from a cold disc is able to explain several puzzling observational properties of X-ray pulsars.

Abstract Copyright: © ESO, 2017

Journal keyword(s): accretion, accretion disks - magnetic fields - X-rays: binaries - X-rays: individuals: GRO J1008-57 - X-rays: individuals: GRO J1008-57

Simbad objects: 6

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Number of rows : 6

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 670 0
2 V* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 408 1
3 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 170 1
4 GRO J1008-571 HXB 10 09 46.9645132055 -58 17 35.603669270       14.63   B0e 177 0
5 3FHL J1746.2-2852 LXB 17 44 33.09 -28 44 27.0           ~ 491 0
6 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 883 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-12:07:24

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