2009A&A...499..163A


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET00:23:49

2009A&A...499..163A - Astronomy and Astrophysics, volume 499, 163-173 (2009/5-3)

Linear polarization in forbidden lines of the T Tauri star RY Tauri.

AKITAYA H., IKEDA Y., KAWABATA K.S., MATSUDA K., OKAZAKI A. and SEKI M.

Abstract (from CDS):

We performed high-dispersion spectropolarimetry for the T Tauri star RY Tauri and measured linear polarization in seven forbidden lines of [OI]λλ5577, 6300, 6364, [NII]λ6583, [SII]λλ6716, 6731, and [FeII]λ7155. This is the first high-dispersion spectropolarimetry for forbidden lines in T Tauri stars. We successfully detected intrinsic polarization in the [OI]λ6300 line. The intrinsic [OI]λ6300 polarization corrected for the foreground polarization was derived as p[OI]=1.17±0.54% and θ[OI]=107°±13°, whereas the polarization of the nearby continuum was pcont=2.4-3.1% and θcont=2°-11°. The position angle of [OI]λ6300 polarization is compared with the circumstellar structures found by previous studies. It is nearly perpendicular to the disk long-axis and parallel to the optical Hα jet. Both the perpendicularity and parallelism potentially suggest relatively axisymmetric distribution of the [OI]λ6300 emitting region and surrounding scattering medium. We constructed a simplified scattering model composed of a point source on a jet axis as an [OI]λ6300 emitter and a flat disk with an inner hole as a scatterer. Applying the observed polarization to the model suggests that the [OI]λ6300 emission emerges close to the central star with a possible separation of less than a fewx0.1AU.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - circumstellar matter - polarization - techniques: polarimetric - techniques: spectroscopic - stars: individual: RY Tauri

Simbad objects: 10

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Number of rows : 10

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 * phi Tau PM* 04 20 21.2169453021 +27 21 02.718203359   6.098 4.951     K0III 78 0
2 V* V1140 Tau a2* 04 20 37.7863585262 +28 53 31.245520190   8.18 7.92     B9/A0 48 0
3 HD 27482 * 04 21 15.2584063723 +27 21 00.898932053   9.38 7.3     M3III 25 0
4 V* RY Tau Or* 04 21 57.4132838427 +28 26 35.533990877 10.82 10.34 9.30 9.67 8.87 K1IV/Ve 657 1
5 HD 27933 * 04 25 38.2609703394 +29 31 36.165374589   9.30 8.19     K0III 8 0
6 HD 282182 PM* 04 26 31.0219967233 +29 15 45.471138463   10.17 9.64     G0 7 0
7 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1234 0
8 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3575 0
9 * mu.02 Cnc PM* 08 07 45.8558112053 +21 34 54.532453099 6.14 5.93 5.30     G1IVb 210 0
10 * kap Del PM* 20 39 07.7860368187 +10 05 10.279480343   5.77   4.6   G2IV 184 0

    Equat.    Gal    SGal    Ecl

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2020.11.28-00:23:49

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