1999A&A...341..768G


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET15:12:49

1999A&A...341..768G - Astronomy and Astrophysics, volume 341, 768-783 (1999/1-3)

Measurements of magnetic field strength on T Tauri stars.

GUENTHER E.W., LEHMANN H., EMERSON J.P. and STAUDE J.

Abstract (from CDS):

We have investigated the magnetic field strength of one weak-line and four classical T Tauri stars. The magnetic field strength is derived from the differential change of the equivalent width of photospheric FeI lines in the presence of a magnetic field, calculated using a full radiative transfer code. The method was successfully tested by applying it to a non-magnetic solar-type star, and to VY Ari which is believed to have a strong magnetic field. For two of the classical T Tauri stars, we find a product of magnetic field strength and filling factor B.f=(2.35±0.15)kG for T Tau, and B.f=(1.1±0.2)kG for LkCa 15. For the classical T Tauri star UX Tau A and the weak-line T Tauri star LkCa 16 the detection is only marginal, indicating magnetic field strengths of the order of 1kG and possibly of more than 2kG, respectively. No field could be detected for the classical T Tauri star GW Ori. For the two classical T Tauri stars for which we have detected a field, we find the filling factors to be larger than ∼0.5, which indicates that the magnetic field covers most of the photosphere. We also show that ignoring a magnetic field can, depending on the lines used, result in errors in effective temperature and underestimates of veiling.

Abstract Copyright:

Journal keyword(s): stars: magnetic fields - stars: pre-main sequence

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BD+63 137 PM* 01 07 08.1980398289 +63 56 28.776559541   10.28   8.2   K7V 101 0
2 HD 16160 PM* 02 36 04.9023844802 +06 53 12.431588708   6.81   5.2   K3V 488 1
3 V* VY Ari RS* 02 48 43.7283572894 +31 06 54.592580835   7.72   6.4   G9 207 0
4 HD 283447 Or* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 383 0
5 V* V410 Tau Or* 04 18 31.1083261392 +28 27 16.155411536   12.13 10.75 8.45 9.408 K3Ve 427 0
6 V* RY Tau Or* 04 21 57.4132838427 +28 26 35.533990877 10.82 10.34 9.30 9.67 8.87 K1IV/Ve 656 1
7 HD 283572 Or* 04 21 58.8482823933 +28 18 06.511915195   9.80 9.03 9.14   G5IVe 269 0
8 NAME T Tau S ** 04 21 59.371 +19 32 05.95           K7 144 2
9 V* T Tau Or* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1258 2
10 V* DF Tau Or* 04 27 02.7917481241 +25 42 22.456361256 11.97 12.25 11.42 10.31 9.14 M3Ve 463 1
11 HD 285778 Or* 04 27 10.5694001840 +17 50 42.660851333   11.07 10.22     K1e 124 0
12 V* UX Tau A TT* 04 30 03.9931880444 +18 13 49.476948664   12.92 11.15     K2Ve 330 0
13 V* UX Tau Or* 04 30 03.99626 +18 13 49.4355 11.23 11.84 10.80 9.83 9.05 K2Ve+M1Ve 317 0
14 EM* LkCa 15 Or* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 565 1
15 V* IW Tau Or* 04 41 04.7179844751 +24 51 06.034940625   14.25 12.595 11.65 10.504 K7Ve 106 0
16 V* SU Aur Or* 04 55 59.3861369488 +30 34 01.499800471   10.33 9.30 9.17   G2IIIne 540 0
17 V* GW Ori Or* 05 29 08.3925564419 +11 52 12.653756566   10.83 10.10 9.52   G5/8Ve 303 0
18 HD 42807 RS* 06 13 12.5027477683 +10 37 37.713412362   7.12   6.0   G5V 203 0
19 * 61 UMa PM* 11 41 03.0159358291 +34 12 05.882438337 6.31 6.08 5.34 4.73 4.38 G8V 570 0
20 CD-33 10685 Or* 15 45 12.8670160093 -34 17 30.646921079 12.47 11.56 10.224 9.60 8.685 K3Ve 223 1

    Equat.    Gal    SGal    Ecl

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2020.11.25-15:12:49

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