Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...499..163a&link_type=abstract
Astronomy and Astrophysics, Volume 499, Issue 1, 2009, pp.163-173
Astronomy and Astrophysics
Astrophysics
Stars: Pre-Main Sequence, Circumstellar Matter, Polarization, Techniques: Polarimetric, Techniques: Spectroscopic, Stars: Individual: Ry Tauri
Scientific paper
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] = 107degr± 13degr, whereas the polarization of the nearby continuum was p_cont=2.4-3.1% and θ_cont=2degr-11degr. 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 Hmathrmα 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 few ×0.1 AU.
Akitaya Hiroshi
Ikeda Yasufumi
Kawabata Koji S.
Matsuda Kazuhide
Okazaki Atsuo
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