Resolved polarization changes across Halpha in the classical T Tauri star RY Tau

Details Resolved polarization changes across Halpha in the classical T Tauri star RY Tau Resolved polarization changes across Halpha in the classical T Tauri star RY Tau

2003-06-04

arxiv.org/abs/astro-ph/0306095v1

Astron.Astrophys. 406 (2003) 703-708

Astronomy and Astrophysics

Astrophysics

5 pages; 3 figures; Accepted by Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20030833

We present linear Halpha spectropolarimetry of the classical T Tauri star RY Tau. A change in the polarization percentage and position angle across Halpha is detected, which suggests that line photons are scattered in a rotating disc. We derive the position angle from the slope of the loop in the (Q,U) diagram and find it to be 146 +/- 3 degrees. This is perpendicular to the position angle of the disc of 48 +/- 5 degrees as deduced from submillimeter imaging by Koerner & Sargent (1995). This finding is consistent, as scattering off the imaged millimeter disc is expected to yield a polarization signature in a direction that is rotated by 90 degrees from this disc. The observed spectropolarimetric behaviour of RY Tau is reminiscent of that seen in a large group of Herbig Ae stars, suggesting a common circumstellar origin of the polarized photons.

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