J/ApJS/165/256 Fluorescent H2 emission from T Tauri stars (Herczeg+, 2006)
The origins of fluorescent H2 emission from T Tauri stars.
Herczeg G.J., Linsky J.L., Walter F.M., Gahm G.F., Johns-Krull C.M.
<Astrophys. J. Suppl. Ser., 165, 256-282 (2006)>
=2006ApJS..165..256H 2006ApJS..165..256H
ADC_Keywords: Stars, pre-main sequence ; Spectroscopy
Keywords: accretion, accretion disks - circumstellar matter -
line: identification - stars: pre-main sequence - ultraviolet: stars
Abstract:
We survey fluorescent H2 emission in HST STIS spectra of the classical
T Tauri stars (CTTSs) TW Hya, DF Tau, RU Lupi, T Tau, and DG Tau, and
the weak-lined T Tauri star (WTTS) V836 Tau. From each of those sources
we detect between 41 and 209 narrow H2 emission lines, most of which
are pumped by strong Lyα emission. H2 emission is not detected
from the WTTS V410 Tau. The fluorescent H2 emission appears to be
common to circumstellar environments around all CTTSs, but high
spectral and spatial resolution STIS observations reveal diverse
phenomenon.
Description:
We observed the T Tauri stars DF Tau, RU Lupi, T Tau, DG Tau,
V836 Tau, V410 Tau, and V819 Tau with HST STIS as part of HST program
GO8157. Each FUV observation consists of 45 orbits using the E140M
echelle spectrograph, spanning 1170-1710Å, with the 0.2"x0.06"
aperture to isolate on-source emission.
Objects:
-----------------------------------------------------------------------------
RA (2000) DE Designation(s) (column(s))
-----------------------------------------------------------------------------
11 01 51.9 -34 42 17 TW Hya = V* TW Hya = HIP 53911 (TWHya)
04 27 02.8 +25 42 22 DF Tau = V* DF Tau = HIP 20777 (DFTau,DFTau2)
15 56 42.3 -37 49 15 RU Lup = V* RU Lup = HIP 78094 (RULup)
04 21 59.4 +19 32 06 T Tau = V* T Tau = HIP 20390 (TTau)
04 27 04.7 +26 06 16 DG Tau = V* DG Tau (DGTau)
05 03 06.6 +25 23 18 V836 Tau = V* V836 Tau (V836Tau)
-----------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table5.dat 129 314 Lyman-band H2 lines, listed by Progression
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 48 A48 --- Trans Transition description
50- 74 A25 --- ID Line or flux type identification (1)
76- 83 F8.3 0.1nm Wave ? Calculated wavelength in Angstroms
85- 89 F5.3 --- Branch ? Branching ratio (2)
91- 95 F5.1 aW/m2 TWHya ? Flux from TW Hya flux (3)
97-101 F5.1 aW/m2 DFTau ? Flux from DF Tau in 0.5"x0.5" aperture (3)
103-107 F5.1 aW/m2 DFTau2 ? Flux from DF Tau in 0.2"x0.06" aperture (3)
109-113 F5.1 aW/m2 RULup ? Flux from RU Lup (3)
115-118 F4.1 aW/m2 TTau ? Flux from T Tau (3)
120-124 F5.1 aW/m2 DGTau ? Flux from DG Tau (3)
126-129 F4.1 aW/m2 V836Tau ? Flux from V836 Tau (3)
--------------------------------------------------------------------------------
Note (1): The total flux in a progression, here termed model flux, may be
larger than the extinction-corrected observed flux because of
unseen lines.
Note (2): Including dissociation percentage.
Note (3): In units of 10-15 erg/s/cm2.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 14-Dec-2007