C.D.S. - SIMBAD4 rel 1.7 - 2019.12.14CET15:03:20

2013A&A...557A.110S - Astronomy and Astrophysics, volume 557A, 110-110 (2013/9-1)

HST far-ultraviolet imaging of DG Tauri. Fluorescent molecular hydrogen emission from the wide opening-angle outflow.


Abstract (from CDS):

One of the most thoroughly studied jets from all young stellar objects is the jet of DG Tau, which we imaged in the far-ultraviolet with the Hubble Space Telescope for the first time. These high spatial resolution images were obtained with long-pass filters and allow us to construct images tracing mainly H2 and CIV emission. We find that the H2 emission appears as a limb-brightened cone with additional emission close to the jet axis. The length of the rims is about 0.3" or 42AU before their brightness strongly drops, and the opening angle is about 90°. Comparing our far-ultraviolet data with near-infrared data we find that the fluorescent H2 emission probably traces the outer, cooler part of the disk wind while an origin of the H2 emission in the surface layers (atmosphere) of the (flared) disk is unlikely. Furthermore, the spatial shape of the H2 emission shows little variation over six years which suggests that the outer part of the disk wind is rather stable and probably not associated with the formation of individual knots. The CIV image shows that the emission is concentrated towards the jet axis. We find no indications for additional CIV emission at larger distances, which strengthens the association with the X-ray emission observed to originate within the DG Tau jet.

Abstract Copyright:

Journal keyword(s): stars: individual: DG Tauri - Herbig-Haro objects - ISM: jets and outflows - stars: variables: T Tauri, Herbig Ae/Be - stars: formation

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 V* T Tau TT* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1239 2
2 NAME T Tau N *i* 04 21 59.433 +19 32 06.42   11.22 10.12 9.80   K1.5 163 1
3 V* DG Tau TT* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 904 1
4 V* HL Tau TT* 04 31 38.437 +18 13 57.65   16.02 15.10 14.21   K5 1137 0
5 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 796 0
6 V* RW Aur TT* 05 07 49.538 +30 24 05.07   10.86 9.60 9.95   K1/5e+K5e 698 0

    Equat.    Gal    SGal    Ecl

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