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 p
cont=2.4-3.1% and θ
cont=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:
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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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