Subarcsecond VLA Observations of HL Tauri: Imaging the Circumstellar Disk

Details Subarcsecond VLA Observations of HL Tauri: Imaging the Circumstellar Disk Subarcsecond VLA Observations of HL Tauri: Imaging the Circumstellar Disk

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...470l.117w&link_type=abstract

Astrophysical Journal Letters v.470, p.L117

Astronomy and Astrophysics

Astronomy

54

Stars: Individual Constellation Name: Hl Tauri, Stars: Formation, Stars: Circumstellar Matter, Radio Continuum: Stars, Accretion, Accretion Disks, Methods: Observational

Scientific paper

We report high-resolution observations of HL Tau at 6 cm, 3.6 cm, and 7 mm using the VLA in B configuration. The new centimeter wavelength data are in accord with previous observations---taking into account resolution and sensitivity---and provide no evidence for time variability. At 7 mm, we have used a "fast-switching" calibration technique to partially overcome the problem of atmospheric phase fluctuations and achieve subarcsecond angular resolution. The 7 mm image, which is dominated by dust emission, shows a flattened structure with Gaussian deconvolved size (0."75 +/- 0."1) x (0."35 +/- 0."1) [(105 +/- 14) x (50 +/- 14) AU] and major axis P.A. 125 deg +/- 10 deg. This orientation is similar to that found at shorter wavelengths and is approximately orthogonal to the optical jet axis, consistent with a dusty accretion disk surrounding the star.

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