2013A&A...550L...1S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:50:49

2013A&A...550L...1S - Astronomy and Astrophysics, volume 550, L1-1 (2013/2-1)

HST FUV C IV observations of the hot DG Tauri jet.

SCHNEIDER P.C., EISLOEFFEL J., GUEDEL M., GUENTHER H.M., HERCZEG G., ROBRADE J. and SCHMITT J.H.M.M.

Abstract (from CDS):

Protostellar jets are tightly connected to the accretion process and regulate the angular momentum balance of accreting star-disk systems. The DG Tau jet is one of the best-studied protostellar jets and contains plasma with temperatures ranging over three orders of magnitude within the innermost 50AU of the jet. We present new Hubble Space Telescope (HST) far-ultraviolet (FUV) long-slit spectra spatially resolving the CIV emission (T∼105K) from the jet for the first time, in addition to quasi-simultaneous HST observations of optical forbidden emission lines ([OI], [NII], [SII], and [OIII]) and fluorescent H2 lines. The CIV emission peaks at ≃42AU from the stellar position and has a FWHM of ≃52AU along the jet. Its deprojected velocity of around 200km/s decreases monotonically away from the driving source. In addition, we compare our HST data with the X-ray emission from the DG Tau jet. We investigate the requirements to explain the data by an initially hot jet compared to local heating. Both scenarios indicate a mass loss by the T∼105K jet of ∼10–9M/yr, i.e., between the values for the lower temperature jet (T≃104K) and the hotter X-ray emitting part (T>106K). However, a simple initially hot wind requires a large launching region (∼1AU), and we therefore favor local heating.

Abstract Copyright:

Journal keyword(s): stars: winds, outflows - stars: pre-main sequence - ISM: jets and outflows - ultraviolet: stars - stars: individual: DG Tauri

Simbad objects: 3

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Number of rows : 3

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 Or* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 923 1
2 RAFGL 5123 FU* 04 31 34.07736 +18 08 04.9020           K3V/M3III 811 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3479 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:50:49

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