2006A&A...453..959M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST00:58:36

2006A&A...453..959M - Astronomy and Astrophysics, volume 453, 959-964 (2006/7-3)

Synchrotron emission from the T Tauri binary system V773 Tauri A.

MASSI M., FORBRICH J., MENTEN K.M., TORRICELLI-CIAMPONI G., NEIDHOEFER J., LEURINI S. and BERTOLDI F.

Abstract (from CDS):

The pre-main sequence binary system V773 Tau A shows remarkable flaring activity around periastron passage. Here, we present the observation of such a flare at a wavelength of 3mm (90GHz) performed with the Plateau de Bure Interferometer. We examine different possible causes for the energy losses responsible for the e-folding time of 2.31±0.19h of that flare. We exclude synchrotron, collisional, and inverse Compton losses because they are not consistent with observational constraints, and we propose that the fading of the emission is due to the leakage of electrons themselves at each reflection between the two mirror points of the magnetic structure partially trapping them. The magnetic structure compatible with both our leakage model and previous observations is that of a helmet streamer that, as in the solar case, can occur at the top of the X-ray-emitting, stellar-sized coronal loops of one of the stars. The streamer may extend up to ∼20R* and interact with the corona of the other star at periastron passage, causing recurring flares. The inferred magnetic field strength at the two mirror points of the helmet streamer is in the range 0.12-125G, and the corresponding Lorentz factor, γ, of the partially trapped electrons is in the range 20<γ<632. We therefore rule out that the emission could be of gyro-synchrotron nature: the derived high Lorentz factor proves that the nature of the emission at 90GHz from this pre-main binary system is synchrotron radiation.

Abstract Copyright:

Journal keyword(s): stars: coronae - stars: individual: V773 Tau A - stars: flare - stars: pre-main sequence - radio continuum: stars - stars: activity

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* UX Ari RS* 03 26 35.3764089427 +28 42 54.211100955 7.76 7.28 6.37     K0IV 657 0
2 HD 283447 TT* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 373 0
3 HD 285778 TT* 04 27 10.5694001840 +17 50 42.660851333   11.07 10.22     K1e 119 0
4 V* IW Tau TT* 04 41 04.7179844751 +24 51 06.034940625   14.25 12.595 11.65 10.504 K7Ve 102 0
5 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 871 1
6 MLLA 761 TT* 05 35 11.8040700 -05 21 49.266135           K5V 48 0
7 M 42 HII 05 35 17.3 -05 23 28           ~ 3658 0
8 NAME Ori A MoC 05 38 -07.1           ~ 2611 0
9 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3615 1

    Equat.    Gal    SGal    Ecl

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2019.10.23-00:58:36

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