The Circumstellar Envelope of ζ Tauri through Optical Interferometry

Details The Circumstellar Envelope of ζ Tauri through Optical Interferometry The Circumstellar Envelope of ζ Tauri through Optical Interferometry

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.1194t&link_type=abstract

The Astronomical Journal, Volume 127, Issue 2, pp. 1194-1203.

Astronomy and Astrophysics

Astronomy

29

Stars: Emission-Line, Be, Stars: Individual: Constellation Name: Ζ Tauri, Techniques: Interferometric

Scientific paper

We present optical interferometric observations of the Be star ζ Tauri obtained using the Navy Prototype Optical Interferometer (NPOI). The multichannel capability of the NPOI allows a high-quality internal calibration of the squared visibilities corresponding to the Hα emission from the circumstellar environment. The observations suggest a strong departure from circular symmetry and thus are described by an elliptical Gaussian model. We use a nonlinear least-squares fit to the data to obtain the likeliest parameters, and the corresponding uncertainties are determined using a Monte Carlo simulation. We obtain 3.14+/-0.21 mas for the angular size of the major axis, -62.3d+/-4.4d for the position angle, and 0.310+/-0.072 for the axial ratio. By comparing our results with those already in the literature, we conclude that the model parameters describing the general characteristics of the circumstellar envelope of ζ Tau appear to be stable on timescales of years. We also compare our results with the known parameters describing the binary nature of ζ Tau, and we conclude that the envelope surrounds only the primary component and is well within its Roche lobe.

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