2000ApJ...534L.101W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST03:50:34

2000ApJ...534L.101W - Astrophys. J., 534, L101-L104 (2000/May-1)

VLA imaging of the disk surrounding the nearby young star TW Hydrae.

WILNER D.J., HO P.T.P., KASTNER J.H. and RODRIGUEZ L.F.

Abstract (from CDS):

The TW Hydrae system is perhaps the closest analog to the early solar nebula. We have used the Very Large Array to image TW Hya at wavelengths of 7 mm and 3.6 cm with resolutions of 0".1 (∼5 AU) and 1".0 (∼50 AU), respectively. The 7 mm emission is extended and appears dominated by a dusty disk of radius greater than 50 AU surrounding the star. The 3.6 cm emission is unresolved and likely arises from an ionized wind or gyrosynchrotron activity. The dust spectrum and spatially resolved 7 mm images of the TW Hya disk are fitted by a simple model with temperature and surface density described by radial power laws, T(r)∝r–0.5 and Σ(r)∝r–1. These properties are consistent with an irradiated gaseous accretion disk of mass ∼0.03 M with an accretion rate ∼10–8 M.yr–1 and viscosity parameter α=0.01. The estimates of mass and mass accretion rates are uncertain since the gas-to-dust ratio in the TW Hya disk may have evolved from the standard interstellar value.

Abstract Copyright:

Journal keyword(s): Accretion, Accretion Disks - Stars: Circumstellar Matter - Radio Continuum: Stars - Stars: Formation - Stars: Individual: Constellation Name: TW Hydrae

CDS comments: Calibrator 1037-295 not in SIMBAD

Simbad objects: 5

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Number of rows : 5

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 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1555 1
2 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 333 0
3 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
4 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 560 1
5 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3775 1

    Equat.    Gal    SGal    Ecl

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2020.10.24-03:50:34

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