2009A&A...508.1117Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST05:16:34

2009A&A...508.1117Z - Astronomy and Astrophysics, volume 508, 1117-1133 (2009/12-4)

MHD simulations of accretion onto a dipolar magnetosphere. I. Accretion curtains and the disk-locking paradigm.

ZANNI C. and FERREIRA J.

Abstract (from CDS):

We investigate the accretion process from an accretion disk onto a magnetized rotating star with a purely dipolar magnetic field. Our main aim is to study the mechanisms that regulate the stellar angular momentum. In this work, we consider two effects that can contrast with the spin-up torque normally associated with accretion: (1) the spin-down torque exerted by an extended magnetosphere connected to the disk beyond the corotation radius; (2) the spin-down torque determined by a stellar wind flowing along the opened magnetospheric field lines. Our study is based on time-dependent axisymmetric magnetohydrodynamic numerical simulations of the interaction between a viscous and resistive accretion disk with the dipolar magnetosphere of a rotating star. We present the first example of a numerical experiment able to model at the same time the formation of accretion curtains, the effects of an extended stellar magnetosphere and the launching of a stellar wind. In the examples presented, the spin-down torque related to the star-disk interaction can extract only ∼10% of the accretion torque, due to the weakness of the extended connection. Not even the spin-down torque exerted by a stellar wind is strong enough (∼20%): despite a huge lever arm (RA≃19R*), the mass-loss rate ({dot}(M)wind≃1%{dot}(M)acc) is too low to provide an efficient torque. We argue that, at least in the case of typical classical T Tauri stars ({dot}(M)acc≃10–8M/yr, B*,dipole≲1kG) rotating at 10% of their break-up speed, the disk spin-down is unlikely to balance the accretion torque (``disk locked'' equilibrium). A massive stellar wind ({dot}(M)wind≃20%{dot}(M)acc) could in principle succeed, but its mass and energy fluxes are quite demanding, both from a theoretical and an observational point of view.

Abstract Copyright:

Journal keyword(s): stars: rotation - stars: magnetic fields - accretion, accretion disks - ISM: jets and outflows - methods: numerical - magnetohydrodynamics (MHD)

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 - 2021
#notes
1 V* BP Tau Or* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 616 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST05:16:34

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
V* BP Tau -- Variable Star of Orion Type
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (HD,CSI,...), X (2E,1RXS,...), IR (AKARI,IRAS,...), Y*O (2010ApJS), V* (V*,AAVSO), Y*? (2018A&A), EmO (MHA), Em* (HBC), TT* (1999AJ), Or* (2017ARep), Er* (2012A&A), UV (XEST)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
04 19 15.8342975037 +29 06 26.929456808 (Optical) [ 0.0542 0.0267 90 ] A 2018yCat.1345....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
04 16 08.5891758078 +28 59 15.642664648 [ 0.0542 0.0267 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
168.3358118137390 -14.9149197135651 [ 0.0542 0.0267 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
8.627 -26.177 [0.144 0.105 90] A 2018yCat.1345....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 15.760 [0.131] / z(spectroscopic) 0.000053 [0.000000] / cz 15.76 [0.13]
   (NIR) A 2019AJ....157..196K
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
7.7474 [0.0578] A 2018yCat.1345....0G
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
K5/7Ve C 1977ApJ...214..747H
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (10) :
B 13.13 [0.19] D 2012yCat.1322....0Z
V 12.12 [0.14] D 2012yCat.1322....0Z
R 11.89 [0.05] E 2012yCat.1322....0Z
G 11.4440 [0.0046] C 2018yCat.1345....0G
J 9.098 [0.037] C 2003yCat.2246....0C
H 8.220 [0.024] C 2003yCat.2246....0C
K 7.736 [0.023] C 2003yCat.2246....0C
g 12.65 [0.17] D 2012yCat.1322....0Z
r 11.57 [0.14] D 2012yCat.1322....0Z
i 10.98 [0.11] D 2012yCat.1322....0Z
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Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).

Hierarchy : number of linked objects
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: 2699 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (34) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 281934 HIC 20160 SV* SVS 691 XEST 28-OM-014
AKARI-IRC-V1 J0419158+290626 HIP 20160 SV* P 2619 XEST 28-100
CSI+28-04162 IRAS 04161+2859 TIC 58287935 [ABG2007] 342
2E 971 JP11 3788 TYC 1827-554-1 [GBA2007] 570
2E 0416.1+2859 2MASS J04191583+2906269 UCAC2 42014678 AAVSO 0413+28
GBS-VLA J041915.84+290626.6 MHA 259-7 UCAC4 596-012169 Gaia DR1 164832735923325440
GCRV 54933 PDS 6 V* BP Tau Gaia DR2 164832740220756608
GSC 01827-00554 1RXS J041915.3+290632 WISE J041915.83+290626.6
HBC 32 SSTtau 041915.8+290626 WISE J041915.83+290626.7

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References (616 between 1850 and 2021) (Total 616)
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


velocities : 3    distance : 1    Fe_H : 2    V* : 2    diameter : 1    ROT : 2    PLX : 4    PM : 4    MK : 3   

   

Observing logs


ISO : 1    herschel : 6    IUE : 81    XMM : 1   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : V* BP Tau

Link by name to the catalogue in VizieR :

HD 281934 AKARI-IRC-V1 J0419158+290626 2E 971 GSC 01827-00554 HIC 20160
HIP 20160 IRAS 04161+2859 2MASS J04191583+2906269 1RXS J041915.3+290632 TYC 1827-554-1
UCAC2 42014678 UCAC4 596-012169 V* BP Tau WISE J041915.83+290626.6 WISE J041915.83+290626.7
Gaia DR1 164832735923325440 Gaia DR2 164832740220756608

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2021.04.15-05:16:34

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