1996A&A...307L...5L

Query : 1996A&A...307L...5L

1996A&A...307L...5L - Astronomy and Astrophysics, volume 307L5-8 (1996/3-1)

On the critical "fastness parameter" of a rotating star with a magnetically threaded accretion disk.

LI X.-D. and WANG Z.-R.

Abstract (from CDS):

The torque exerted on a rotating, magnetized star by a magnetically threaded accretion disk is dependent on the "fastness parameter" ωs=(R0/Rc)^3/2 where R0 and Rc are the inner edge of the accretion disk and the corotation radius of the star respectively. In equilibrium state for which there is no torque on the star, the fastness parameter reaches its critical value ωc. Recently Wang (1995) obtained that the value of ωc lies in the range 0.875-0.95. We argue that an uncertainty of a factor of 4 exists in the torque condition at the inner edge of the disk. Together with uncertainties relating to the strength of the toroidal field, we find that the value of ωc can range between 0.71 and 0.95. Our results present constraints on the magnetically threaded disk model and seem to be consistent with observations of the binary X-ray pulsar 4U1626-67.

Abstract Copyright: ∼

Journal keyword(s): accretion, accretion disks - stars: magnetic fields - stars: rotation

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 626 1

Query : 1996A&A...307L...5L

Basic data :
V* KZ TrA -- Low Mass X-ray Binary
Other object types: otypes_help 		X (2022MNRAS,4U,...), LXB (2013ApJS), Psr (2007ApJS,PSR), gam (INTEGRAL1,INTREF), N* (2014MNRAS), V* (V*)
ICRS coord. (ep=J2000) : 		16 32 16.79 -67 27 39.3 (X-ray) [ 700 700 90 ] C 2012ApJ...756...27L
FK4 coord. (ep=B1950 eq=1950) : 		16 27 14.69 -67 21 14.6 [ 700 700 90 ]
Gal coord. (ep=J2000) : 		321.78837 -13.09171 [ 700 700 90 ]
Fluxes (3) :
U 17.40 [~] D 2007A&A...469..807L
B 18.60 [~] D 2007A&A...469..807L
V 18.5 [~] D 2007A&A...469..807L
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notes:

Identifiers (24) :
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4U 1626-67 INTEGRAL1 26 1RXS J163217.0-672743 3U 1626-67
2A 1627-673 INTREF 700 2S 1627-673 4U 1626-673
3A 1627-674 1M 1626-673 SRGA J163217.0-672738 V* KZ TrA
1H 1627-673 2MAXI J1632-674 SWIFT J1632.4-6729 2XMM J163216.7-672739
H 1616-67 PBC J1632.2-6727 SWIFT J1632.3-6725 [BM83] X1627-673
H 1627-673 PSR B1627-67.3 2U 1626-67 [KRL2007b] 191

References (626 between 1850 and 2026) (Total 626)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Distance : 1   

   

Observing logs
XMM : 4   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* KZ TrA

Link by name to the catalogue in VizieR :

1RXS J163217.0-672743 V* KZ TrA

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