High-Resolution Near-Infrared Images of the T Tauri Binary System XZ Tauri

Details High-Resolution Near-Infrared Images of the T Tauri Binary System XZ Tauri High-Resolution Near-Infrared Images of the T Tauri Binary System XZ Tauri

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61.1271h&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.6, pp.1271--1279

Astronomy and Astrophysics

Astronomy

1

Stars: Individual (Xz Tau), Stars: Pre-Main Sequence, Techniques: High Angular Resolution

Scientific paper

We present a high-resolution (˜0.1'' = 14AU) H-band image of XZ Tau, a 0.3''-separated classical T Tauri binary system, taken with the Coronagraphic Imager with Adaptive Optics (CIAO) on the Subaru Telescope. We found a scattered light nebula extending to ˜2.4'' from the secondary, XZ Tau S, in the northeast region of the binary. Its surface brightness is ˜16.2 mag arcsec-2 in the H-band, and decreases as r-1.6±0.1. Combined with the HST/ACS polarimetric images and the [Fe II] λ1.644μm spectra taken with the Infrared Camera and Spectrograph (IRCS) on the Subaru Telescope, the elongated structure is identified as a wall of a cavity blown by the previously known blueshifted outflow. By a comparison with previous measurements, we estimated that the orbital period is 1010±260 yr and the total mass of the binary is 0.62±0.36Modot. The observed H-band magnitudes of both the primary and the secondary varied by as much as 1 mag over this decade. These H-band inconstancies may arise from a variable accretion rate and changing extinction toward each component.

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