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


Query : 2009A&A...499..163A

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 - 2023
#notes
1 * phi Tau PM* 04 20 21.2160972528 +27 21 02.708298576   6.098 4.951     K0III 80 0
2 V* V1140 Tau a2* 04 20 37.7861065824 +28 53 31.244361108   8.18 7.92     B9/A0 61 0
3 HD 27482 * 04 21 15.2584575984 +27 21 00.890395056   9.38 7.3     M3III 27 0
4 V* RY Tau Or* 04 21 57.4092550080 +28 26 35.555316612 10.82 10.34 9.30 9.67 8.87 K1IV/Ve 684 1
5 HD 27933 * 04 25 38.2608912360 +29 31 36.165993492   9.30 8.19     K0III 10 0
6 HD 282182 PM* 04 26 31.0223044176 +29 15 45.471465432   10.17 9.64     G0 10 0
7 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1318 0
8 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4102 0
9 * mu.02 Cnc PM* 08 07 45.8562513552 +21 34 54.526814256 6.14 5.93 5.30     G1IVb 219 0
10 * kap Del PM* 20 39 07.7867477765 +10 05 10.291671448   5.77   4.6   G2IV 190 0

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2023.02.08-01:03:50

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