2019A&A...626A..18C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:11:11

2019A&A...626A..18C - Astronomy and Astrophysics, volume 626A, 18-18 (2019/6-1)

Super-Eddington accretion discs with advection and outflows around magnetized neutron stars.

CHASHKINA A., LIPUNOVA G., ABOLMASOV P. and POUTANEN J.

Abstract (from CDS):

We present a model for a super-Eddington accretion disc around a magnetized neutron star taking into account advection of heat and the mass loss by the wind. The model is semi-analytical and predicts radial profiles of all the basic physical characteristics of the accretion disc. The magnetospheric radius is found as an eigenvalue of the problem. When the inner disc is in radiation-pressure-dominated regime but does not reach its local Eddington limit, advection is mild, and the radius of the magnetosphere depends weakly on the accretion rate. Once it approaches the local Eddington limit the disc becomes advection-dominated, and the scaling for the magnetospheric radius with the mass accretion rate is similar to the classical Alfven relation. Allowing for the mass loss in a wind leads to an increase in the magnetospheric radius. Our model can be applied to a wide variety of magnetized neutron stars accreting close to or above their Eddington limits: ultra-luminous X-ray pulsars, Be/X-ray binaries in outbursts, and other systems. In the context of our model we discuss the observational properties of NGC 5907 X-1, the brightest ultra-luminous pulsar currently known, and NGC 300 ULX1, which is apparently a Be/X-ray binary experiencing a very bright super-Eddington outburst.

Abstract Copyright: © ESO 2019

Journal keyword(s): accretion, accretion disks - stars: neutron - stars: magnetic field - X-rays: binaries

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LIN 198 HXB 00 52 05.6254079356 -72 26 04.230639207 13.86 14.91 14.91 14.91   B0-5(II)e 124 0
2 NAME NGC 300 2010da s*b 00 55 04.86 -37 41 43.7           LBV 96 0
3 SWIFT J0243.6+6124 Psr 02 43 40.4249772475 +61 26 03.757301990   13.71 12.84 12.57   ~ 50 0
4 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 161 1
5 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5336 6
6 RX J133001+47137 UX? 13 30 01.01 +47 13 43.9           ~ 41 0
7 NAME NGC 5907 ULX ULX 15 15 58.60 +56 18 10.0           ~ 86 0
8 NAME NGC 7793 X-1 X 23 57 50.90 -32 37 26.6           ~ 113 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:11:11

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