2004A&A...416..213T


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.27CET03:23:33

2004A&A...416..213T - Astronomy and Astrophysics, volume 416, 213-219 (2004/3-2)

Detection of a warm molecular wind in DG Tauri.

TAKAMI M., CHRYSOSTOMOU A., RAY T.P., DAVIS C., DENT W.R.F., BAILEY J., TAMURA M. and TERADA H.

Abstract (from CDS):

We detect near-infrared H2 emission in DG Tau using the Infrared Camera and Spectrograph (IRCS) on the 8.2-m SUBARU telescope. The spectra obtained along the jet axis show that the centroidal position of the 1-0S(1) emission is offset by 0.2'' from the star towards the jet, while those obtained perpendicular to the jet axis show a marginal extension, indicating that the emission line region has a typical width of ∼0.6''. Their line profiles show a peak velocity of ∼15km/s blueshifted from the systemic velocity. These results indicate that the emission originates from a warm molecular wind with a flow length and width of ∼40 and ∼80AU, respectively. The line flux ratios (I1–0S(0)/I1–0S(1) and an upper limit for I2–1S(1)/I1–0S(1)) suggest that the flow is thermalized at a temperature of ∼2000K, and is likely heated by shocks or ambipolar diffusion. The observed velocity and spatial extension suggest that the H2 and forbidden line emission originate from different components of the same flow, i.e., a fast and partially ionised component near the axis and a slow molecular component surrounding it. Such a flow geometry agrees with model predictions of magneto-centrifugal driven winds.

Abstract Copyright:

Journal keyword(s): line: formation - stars: pre-main sequence - ISM: jets and outflows

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* DG Tau TT* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 912 1
2 V* GG Tau TT* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 634 1
3 EM* LkCa 15 TT* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 534 1
4 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1476 1
5 Haro 1-6 TT* 16 26 03.0281201323 -24 23 36.193999164   14.15 14.01 12.38 10.80 K0 200 1

    Equat.    Gal    SGal    Ecl

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2020.01.27-03:23:33

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